Communication device, communication method, and program

ABSTRACT

[Solution] A communication device includes: a communication unit configured to perform wireless communication; and a control unit configured to selectively switch between a first physical channel and a second physical channel in which both conditions of the number of symbols and the number of resource blocks are different from each other and which are allocated during a predetermined period in a time direction to transmit control information to a base station.

TECHNICAL FIELD

The present disclosure relates to a communication device, acommunication method, and a program.

BACKGROUND ART

Wireless access schemes and wireless networks of cellular mobilecommunication (hereinafter also referred to as Long Term Evolution(LTE), LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro), New Radio(NR), New Radio Access Technology (NRAT), Evolved Universal TerrestrialRadio Access (EUTRA), or Further EUTRA (FEUTRA)) are under review in 3rdGeneration Partnership Project (3GPP). Further, in the followingdescription, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includesNRAT and FEUTRA. In LTE and NR, a base station device (base station) isalso referred to as an evolved Node B (eNodeB), and a terminal device (amobile station, a mobile station device, or a terminal) is also referredto as a user equipment (UE). LTE and NR are cellular communicationsystems in which a plurality of areas covered by a base station deviceis arranged in a cell form. A single base station device may manage aplurality of cells.

NR is a different Radio Access Technology (RAT) from LTE as a wirelessaccess scheme of the next generation of LTE. NR is an access technologycapable of handling various use cases including Enhanced Mobilebroadband (eMBB), Massive Machine Type Communications (mMTC), and ultrareliable and Low Latency Communications (URLLC). NR is reviewed for thepurpose of a technology framework corresponding to use scenarios,request conditions, placement scenarios, and the like in such use cases.The details of the scenarios or request conditions of NR are disclosedin Non-Patent Literature 1.

CITATION LIST Non-Patent Literature

Non-Patent Literature 1: 3rd Generation Partnership Project; TechnicalSpecification Group Radio Access Network; Study on Scenarios andRequirements for Next Generation Access Technologies; (Release 14), 3GPPTR 38.913 V0. 3.0 (2016-03).<http://www.3gpp.org/ftp//Specs/archive/38_series/38.913/38913-030.zip>

DISCLOSURE OF INVENTION Technical Problem

In wireless access technologies, it is preferable to flexibly designcapabilities of terminal devices such as decoding processes for downlinkchannels or generation processes for uplink channels in accordance withuse cases. From the viewpoint of frequency use efficiency, it isimportant to perform multiplexing of the plurality of flexibly designedwireless access technologies. Then, in accordance with the capabilitiesof terminal devices which are communication targets, it is preferable toflexibly switch between configurations of uplink control channels aswell. However, it is difficult to multiplex the configurations of theplurality of uplink control channels.

Accordingly, the present disclosure proposes a communication device, acommunication method, and a program capable of multiplexingconfigurations of a plurality of uplink control channels in a preferredmode in a communication system in which a base station device and aterminal device communicate with each other.

Solution to Problem

According to the present disclosure, there is provided a communicationdevice including: a communication unit configured to perform wirelesscommunication; and a control unit configured to selectively switchbetween a first physical channel and a second physical channel in whichboth conditions of the number of symbols and the number of resourceblocks are different from each other and which are allocated during apredetermined period in a time direction to transmit control informationto a base station.

In addition, according to the present disclosure, there is provided acommunication device including: a communication unit configured toperform wireless communication; and a notification unit configured tonotify a terminal device of information regarding switching between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period in a time direction to receive control informationfrom the terminal device.

In addition, according to the present disclosure, there is provided acommunication method including: performing wireless communication; andselectively switching between a first physical channel and a secondphysical channel in which both conditions of the number of symbols andthe number of resource blocks are different from each other and whichare allocated during a predetermined period in a time direction totransmit control information to a base station by a computer.

In addition, according to the present disclosure, there is provided acommunication method including: performing wireless communication; andnotifying a terminal device of information regarding switching between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period in a time direction to receive control informationfrom the terminal device by a computer.

In addition, according to the present disclosure, there is provided aprogram causing a computer to: perform wireless communication; andselectively switch between a first physical channel and a secondphysical channel in which both conditions of the number of symbols andthe number of resource blocks are different from each other and whichare allocated during a predetermined period in a time direction totransmit control information to a base station.

In addition, according to the present disclosure, there is provided aprogram causing a computer to: perform wireless communication; andnotify a terminal device of information regarding switching between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period in a time direction to receive control informationfrom the terminal device.

Advantageous Effects of Invention

According to the present disclosure, as described above, it is possibleto provide a communication device, a communication method, and a programcapable of multiplexing configurations of a plurality of uplink controlchannels in a preferred mode in a communication system in which a basestation device and a terminal device communicate with each other.

Note that the effects described above are not necessarily limitative.With or in the place of the above effects, there may be achieved any oneof the effects described in this specification or other effects that maybe grasped from this specification.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to an embodiment of the present disclosure.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to the embodiment.

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the embodiment.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the embodiment.

FIG. 5 is a diagram illustrating examples of parameter sets related to atransmission signal in an NR cell.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the embodiment.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe embodiment.

FIG. 8 is a schematic block diagram illustrating a configuration of abase station device of the embodiment.

FIG. 9 is a schematic block diagram illustrating a configuration of aterminal device of the embodiment.

FIG. 10 is a diagram illustrating an example of downlink resourceelement mapping of LTE according to the embodiment.

FIG. 11 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the embodiment.

FIG. 12 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the embodiment.

FIG. 13 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the embodiment.

FIG. 14 is a diagram illustrating an example of a frame configuration ofa self-contained transmission according to the embodiment.

FIG. 15 is an explanatory diagram describing an example of aconfiguration of a first NR-PUCCH.

FIG. 16 is an explanatory diagram describing another example of aconfiguration of a first NR-PUCCH.

FIG. 17 is an explanatory diagram describing an example of aconfiguration of a second NR-PUCCH.

FIG. 18 is an explanatory diagram describing another example of aconfiguration of a second NR-PUCCH.

FIG. 19 is an explanatory diagram describing an example oflogical-physical mapping of first NR-PUCCH resources.

FIG. 20 is an explanatory diagram describing an example oflogical-physical mapping of second NR-PUCCH resources.

FIG. 21 is an explanatory diagram describing another example oflogical-physical mapping of second NR-PUCCH resources.

FIG. 22 is an explanatory diagram illustrating an example of time domainmultiplexing of a first NR-PUCCH and a second NR-PDCCH.

FIG. 23 is an explanatory diagram illustrating an example of frequencydomain multiplexing of a first NR-PUCCH and a second NR-PUCCH.

FIG. 24 is a block diagram illustrating a first example of a schematicconfiguration of an eNB.

FIG. 25] FIG. 25 is a block diagram illustrating a second example of theschematic configuration of the eNB.

FIG. 26 is a block diagram illustrating an example of a schematicconfiguration of a smartphone.

FIG. 27 is a block diagram illustrating an example of a schematicconfiguration of a car navigation apparatus.

MODE(S) FOR CARRYING OUT THE INVENTION

Hereinafter, (a) preferred embodiment(s) of the present disclosure willbe described in detail with reference to the appended drawings. Notethat, in this specification and the appended drawings, structuralelements that have substantially the same function and structure aredenoted with the same reference numerals, and repeated explanation ofthese structural elements is omitted.

Note that the description will be made in the following order.

1. Embodiment 1.1. Overview

1.2. Wireless frame configuration1.3. Channel and signal

1.4. Configuration

1.5. Control information and control channel

1.6. CA and DC

1.7. Resource allocation1.8. Error correction1.9. Resource element mapping1.10 Self-contained transmission1.11. Technical features2. Application examples2.1. Application example related to base station2.2. Application example related to terminal device

3. Conclusion 1. EMBODIMENT <1.1. Overview>

Hereinafter. (a) preferred embodiment(s) of the present disclosure willbe described in detail with reference to the appended drawings. Notethat, in this specification and the appended drawings, structuralelements that have substantially the same function and structure aredenoted with the same reference numerals, and repeated explanation ofthese structural elements is omitted. Further, technologies, functions,methods, configurations, and procedures to be described below and allother descriptions can be applied to LTE and NR unless particularlystated otherwise.

<Wireless Communication System in the Present Embodiment>

In the present embodiment, a wireless communication system includes atleast a base station device 1 and a terminal device 2. The base stationdevice 1 can accommodate multiple terminal devices. The base stationdevice 1 can be connected with another base station device by means ofan X2 interface. Further, the base station device 1 can be connected toan evolved packet core (EPC) by means of an S1 interface. Further, thebase station device 1 can be connected to a mobility management entity(MME) by means of an S1-MME interface and can be connected to a servinggateway (S-GW) by means of an S1-U interface. The S1 interface supportsmany-to-many connection between the MME and/or the S-GW and the basestation device 1. Further, in the present embodiment, the base stationdevice 1 and the terminal device 2 each support LTE and/or NR.

<Wireless Access Technology According to Present Embodiment>

In the present embodiment, the base station device 1 and the terminaldevice 2 each support one or more wireless access technologies (RATs).For example, an RAT includes LTE and NR. A single RAT corresponds to asingle cell (component carrier). That is, in a case in which a pluralityof RATs is supported, the RATs each correspond to different cells. Inthe present embodiment, a cell is a combination of a downlink resource,an uplink resource, and/or a sidelink. Further, in the followingdescription, a cell corresponding to LTE is referred to as an LTE celland a cell corresponding to NR is referred to as an NR cell.

Downlink communication is communication from the base station device 1to the terminal device 2. Downlink transmission is transmission from thebase station device 1 to the terminal device 2 and is transmission of adownlink physical channel and/or a downlink physical signal. Uplinkcommunication is communication from the terminal device 2 to the basestation device 1. Uplink transmission is transmission from the terminaldevice 2 to the base station device 1 and is transmission of an uplinkphysical channel and/or an uplink physical signal. Sidelinkcommunication is communication from the terminal device 2 to anotherterminal device 2. Sidelink transmission is transmission from theterminal device 2 to another terminal device 2 and is transmission of asidelink physical channel and/or a sidelink physical signal.

The sidelink communication is defined for contiguous direct detectionand contiguous direct communication between terminal devices. Thesidelink communication, a frame configuration similar to that of theuplink and downlink can be used. Further, the sidelink communication canbe restricted to some (sub sets) of uplink resources and/or downlinkresources.

The base station device 1 and the terminal device 2 can supportcommunication in which a set of one or more cells is used in a downlink,an uplink, and/or a sidelink. Communication using a set of a pluralityof cells or a set of a plurality of cells is also referred to as carrieraggregation or dual connectivity. The details of the carrier aggregationand the dual connectivity will be described below. Further, each celluses a predetermined frequency bandwidth. A maximum value, a minimumvalue, and a settable value in the predetermined frequency bandwidth canbe specified in advance.

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 1,one LTE cell and two NR cells are set. One LTE cell is set as a primarycell. Two NR cells are set as a primary secondary cell and a secondarycell. Two NR cells are integrated by the carrier aggregation. Further,the LTE cell and the NR cell are integrated by the dual connectivity.Note that the LTE cell and the NR cell may be integrated by carrieraggregation. In the example of FIG. 1, NR may not support some functionssuch as a function of performing standalone communication sinceconnection can be assisted by an LTE cell which is a primary cell. Thefunction of performing standalone communication includes a functionnecessary for initial connection.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 2,two NR cells are set. The two NR cells are set as a primary cell and asecondary cell, respectively, and are integrated by carrier aggregation.In this case, when the NR cell supports the function of performingstandalone communication, assist of the LTE cell is not necessary. Notethat the two NR cells may be integrated by dual connectivity.

<1.2. Radio Frame Configuration> <Radio Frame Configuration in PresentEmbodiment>

In the present embodiment, a radio frame configured with 10 ms(milliseconds) is specified. Each radio frame includes two half frames.A time interval of the half frame is 5 ms. Each half frame includes 5sub frames. The time interval of the sub frame is 1 ms and is defined bytwo successive slots. The time interval of the slot is 0.5 ms. An i-thsub frame in the radio frame includes a (2×i)-th slot and a (2×i+1)-thslot. In other words, 10 sub frames are specified in each of the radioframes.

Sub frames include a downlink sub frame, an uplink sub frame, a specialsub frame, a sidelink sub frame, and the like.

The downlink sub frame is a sub frame reserved for downlinktransmission. The uplink sub frame is a sub frame reserved for uplinktransmission. The special sub frame includes three fields. The threefields are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), andan Uplink Pilot Time Slot (UpPTS). A total length of DwPTS, GP, andUpPTS is 1 ms. The DwPTS is a field reserved for downlink transmission.The UpPTS is a field reserved for uplink transmission. The GP is a fieldin which downlink transmission and uplink transmission are notperformed. Further, the special sub frame may include only the DwPTS andthe GP or may include only the GP and the UpPTS. The special sub frameis placed between the downlink sub frame and the uplink sub frame in TDDand used to perform switching from the downlink sub frame to the uplinksub frame. The sidelink sub frame is a sub frame reserved or set forsidelink communication. The sidelink is used for contiguous directcommunication and contiguous direct detection between terminal devices.

A single radio frame includes a downlink sub frame, an uplink sub frame,a special sub frame, and/or a sidelink sub frame. Further, a singleradio frame includes only a downlink sub frame, an uplink sub frame, aspecial sub frame, or a sidelink sub frame.

A plurality of radio frame configurations is supported. The radio frameconfiguration is specified by the frame configuration type. The frameconfiguration type 1 can be applied only to FDD. The frame configurationtype 2 can be applied only to TDD. The frame configuration type 3 can beapplied only to an operation of a licensed assisted access (LAA)secondary cell.

In the frame configuration type 2, a plurality of uplink-downlinkconfigurations is specified. In the uplink-downlink configuration, eachof 10 sub frames in one radio frame corresponds to one of the downlinksub frame, the uplink sub frame, and the special sub frame. The subframe 0, the sub frame 5 and the DwPTS are constantly reserved fordownlink transmission. The UpPTS and the sub frame just after thespecial sub frame are constantly reserved for uplink transmission.

In the frame configuration type 3, 10 sub frames in one radio frame arereserved for downlink transmission. The terminal device 2 treats a subframe by which PDSCH or a detection signal is not transmitted, as anempty sub frame. Unless a predetermined signal, channel and/or downlinktransmission is detected in a certain sub frame, the terminal device 2assumes that there is no signal and/or channel in the sub frame. Thedownlink transmission is exclusively occupied by one or more consecutivesub frames. The first sub frame of the downlink transmission may bestarted from any one in that sub frame. The last sub frame of thedownlink transmission may be either completely exclusively occupied orexclusively occupied by a time interval specified in the DwPTS.

Further, in the frame configuration type 3, 10 sub frames in one radioframe may be reserved for uplink transmission. Further, each of 10 subframes in one radio frame may correspond to any one of the downlink subframe, the uplink sub frame, the special sub frame, and the sidelink subframe.

The base station device 1 may transmit a downlink physical channel and adownlink physical signal in the DwPTS of the special sub frame. The basestation device 1 can restrict transmission of the PBCH in the DwPTS ofthe special sub frame. The terminal device 2 may transmit uplinkphysical channels and uplink physical signals in the UpPTS of thespecial sub frame. The terminal device 2 can restrict transmission ofsome of the uplink physical channels and the uplink physical signals inthe UpPTS of the special sub frame.

Note that a time interval in single transmission is referred to as atransmission time interval (TTI) and 1 ms (1 sub frame) is defined as 1TTI in LTE.

<Frame Configuration of LTE in Present Embodiment>

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.3 is referred to as a downlink resource grid of LTE. The base stationdevice 1 can transmit a downlink physical channel of LTE and/or adownlink physical signal of LTE in a downlink sub frame to the terminaldevice 2. The terminal device 2 can receive a downlink physical channelof LTE and/or a downlink physical signal of LTE in a downlink sub framefrom the base station device 1.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.4 is referred to as an uplink resource grid of LTE. The terminal device2 can transmit an uplink physical channel of LTE and/or an uplinkphysical signal of LTE in an uplink sub frame to the base station device1. The base station device 1 can receive an uplink physical channel ofLTE and/or an uplink physical signal of LTE in an uplink sub frame fromthe terminal device 2.

In the present embodiment, the LTE physical resources can be defined asfollows. One slot is defined by a plurality of symbols. The physicalsignal or the physical channel transmitted in each of the slots isrepresented by a resource grid. In the downlink, the resource grid isdefined by a plurality of sub carriers in a frequency direction and aplurality of OFDM symbols in a time direction. In the uplink, theresource grid is defined by a plurality of sub carriers in the frequencydirection and a plurality of SC-FDMA symbols in the time direction. Thenumber of sub carriers or the number of resource blocks may be decideddepending on a bandwidth of a cell. The number of symbols in one slot isdecided by a type of cyclic prefix (CP). The type of CP is a normal CPor an extended CP. In the normal CP, the number of OFDM symbols orSC-FDMA symbols constituting one slot is 7. In the extended CP, thenumber of OFDM symbols or SC-FDMA symbols constituting one slot is 6.Each element in the resource grid is referred to as a resource element.The resource element is identified using an index (number) of a subcarrier and an index (number) of a symbol. Further, in the descriptionof the present embodiment, the OFDM symbol or SC-FDMA symbol is alsoreferred to simply as a symbol.

The resource blocks are used for mapping a certain physical channel (thePDSCH, the PUSCH, or the like) to resource elements. The resource blocksinclude virtual resource blocks and physical resource blocks. A certainphysical channel is mapped to a virtual resource block. The virtualresource blocks are mapped to physical resource blocks. One physicalresource block is defined by a predetermined number of consecutivesymbols in the time domain. One physical resource block is defined froma predetermined number of consecutive sub carriers in the frequencydomain. The number of symbols and the number of sub carriers in onephysical resource block are decided on the basis of a parameter set inaccordance with a type of CP, a sub carrier interval, and/or a higherlayer in the cell. For example, in a case in which the type of CP is thenormal CP, and the sub carrier interval is 15 kHz, the number of symbolsin one physical resource block is 7, and the number of sub carriers is12. In this case, one physical resource block includes (7×12) resourceelements. The physical resource blocks are numbered from 0 in thefrequency domain. Further, two resource blocks in one sub framecorresponding to the same physical resource block number are defined asa physical resource block pair (a PRB pair or an RB pair).

In each LTE cell, one predetermined parameter is used in a certain subframe. For example, the predetermined parameter is a parameter (physicalparameter) related to a transmission signal. Parameters related to thetransmission signal include a CP length, a sub carrier interval, thenumber of symbols in one sub frame (predetermined time length), thenumber of sub carriers in one resource block (predetermined frequencyband), a multiple access scheme, a signal waveform, and the like.

That is, In the LTE cell, a downlink signal and an uplink signal areeach generated using one predetermined parameter in a predetermined timelength (for example, a sub frame). In other words, in the terminaldevice 2, it is assumed that a downlink signal to be transmitted fromthe base station device 1 and an uplink signal to be transmitted to thebase station device 1 are each generated with a predetermined timelength with one predetermined parameter. Further, the base stationdevice 1 is set such that a downlink signal to be transmitted to theterminal device 2 and an uplink signal to be transmitted from theterminal device 2 are each generated with a predetermined time lengthwith one predetermined parameter.

<Frame Configuration of NR in Present Embodiment>

In each NR cell, one or more predetermined parameters are used in acertain predetermined time length (for example, a sub frame). That is,in the NR cell, a downlink signal and an uplink signal are eachgenerated using or more predetermined parameters in a predetermined timelength. In other words, in the terminal device 2, it is assumed that adownlink signal to be transmitted from the base station device 1 and anuplink signal to be transmitted to the base station device 1 are eachgenerated with one or more predetermined parameters in a predeterminedtime length. Further, the base station device 1 is set such that adownlink signal to be transmitted to the terminal device 2 and an uplinksignal to be transmitted from the terminal device 2 are each generatedwith a predetermined time length using one or more predeterminedparameters. In a case in which the plurality of predetermined parametersare used, a signal generated using the predetermined parameters ismultiplexed in accordance with a predetermined method. For example, thepredetermined method includes Frequency Division Multiplexing (FDM),Time Division Multiplexing (TDM), Code Division Multiplexing (CDM),and/or Spatial Division Multiplexing (SDM).

In a combination of the predetermined parameters set in the NR cell, aplurality of kinds of parameter sets can be specified in advance.

FIG. 5 is a diagram illustrating examples of the parameter sets relatedto a transmission signal in the NR cell. In the example of FIG. 5,parameters of the transmission signal included in the parameter setsinclude a sub carrier interval, the number of sub carriers per resourceblock in the NR cell, the number of symbols per sub frame, and a CPlength type. The CP length type is a type of CP length used in the NRcell. For example, CP length type 1 is equivalent to a normal CP in LTEand CP length type 2 is equivalent to an extended CP in LTE.

The parameter sets related to a transmission signal in the NR cell canbe specified individually with a downlink and an uplink. Further, theparameter sets related to a transmission signal in the NR cell can beset independently with a downlink and an uplink.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the present embodiment. In the example of FIG. 6, signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as a downlink resource grid of NR. Thebase station device 1 can transmit the downlink physical channel of NRand/or the downlink physical signal of NR in a downlink sub frame to theterminal device 2. The terminal device 2 can receive a downlink physicalchannel of NR and/or the downlink physical signal of NR in a downlinksub frame from the base station device 1.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe present embodiment. In the example of FIG. 7, signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as an uplink resource grid of NR. The basestation device 1 can transmit the uplink physical channel of NR and/orthe uplink physical signal of NR in an uplink sub frame to the terminaldevice 2. The terminal device 2 can receive an uplink physical channelof NR and/or the uplink physical signal of NR in an uplink sub framefrom the base station device 1.

<Antenna Port in Present Embodiment>

An antenna port is defined so that a propagation channel carrying acertain symbol can be inferred from a propagation channel carryinganother symbol in the same antenna port. For example, different physicalresources in the same antenna port can be assumed to be transmittedthrough the same propagation channel. In other words, for a symbol in acertain antenna port, it is possible to estimate and demodulate apropagation channel in accordance with the reference signal in theantenna port. Further, there is one resource grid for each antenna port.The antenna port is defined by the reference signal. Further, eachreference signal can define a plurality of antenna ports.

The antenna port is specified or identified with an antenna port number.For example, antenna ports 0 to 3 are antenna ports with which CRS istransmitted. That is, the PDSCH transmitted with antenna ports 0 to 3can be demodulated to CRS corresponding to antenna ports 0 to 3.

In a case in which two antenna ports satisfy a predetermined condition,the two antenna ports can be regarded as being a quasi co-location(QCL). The predetermined condition is that a wide area characteristic ofa propagation channel carrying a symbol in one antenna port can beinferred from a propagation channel carrying a symbol in another antennaport. The wide area characteristic includes a delay dispersion, aDoppler spread, a Doppler shift, an average gain, and/or an averagedelay.

In the present embodiment, the antenna port numbers may be defineddifferently for each RAT or may be defined commonly between RATs. Forexample, antenna ports 0 to 3 in LTE are antenna ports with which CRS istransmitted. In the NR, antenna ports 0 to 3 can be set as antenna portswith which CRS similar to that of LTE is transmitted. Further, in NR,the antenna ports with which CRS is transmitted like LTE can be set asdifferent antenna port numbers from antenna ports 0 to 3. In thedescription of the present embodiment, predetermined antenna portnumbers can be applied to LTE and/or NR.

<1.3. Channel and Signal> <Physical Channel and Physical Signal inPresent Embodiment>

In the present embodiment, physical channels and physical signals areused. The physical channels include a downlink physical channel, anuplink physical channel, and a sidelink physical channel. The physicalsignals include a downlink physical signal, an uplink physical signal,and a sidelink physical signal.

In LTE, a physical channel and a physical signal are referred to as anLTE physical channel and an LTE physical signal. In NR, a physicalchannel and a physical signal are referred to as an NR physical channeland an NR physical signal. The LTE physical channel and the NR physicalchannel can be defined as different physical channels, respectively. TheLTE physical signal and the NR physical signal can be defined asdifferent physical signals, respectively. In the description of thepresent embodiment, the LTE physical channel and the NR physical channelare also simply referred to as physical channels, and the LTE physicalsignal and the NR physical signal are also simply referred to asphysical signals. That is, the description of the physical channels canbe applied to any of the LTE physical channel and the NR physicalchannel. The description of the physical signals can be applied to anyof the LTE physical signal and the NR physical signal.

<NR Physical Channel and NR Physical Signal in Present Embodiment>

The description of the physical channel and the physical signal in theLTED can also be applied to the NR physical channel and the NR physicalsignal, respectively. The NR physical channel and the NR physical signalare referred to as the following.

The NR uplink physical channel includes an NR-PUSCH (Physical UplinkShared Channel), an NR-PUCCH (Physical Uplink Control Channel), anNR-PRACH (Physical Random Access Channel), and the like.

The NR physical downlink signal includes an NR-SS, an NR-DL-RS, anNR-DS, and the like. The NR-SS includes an NR-PSS, an NR-SSS, and thelike.

The NR-RS includes an NR-CRS, an NR-PDSCH-DMRS, an NR-EPDCCH-DMRS, anNR-PRS, an NR-CSI-RS, an NR-TRS, and the like.

The NR physical uplink channel includes an NR-PUSCH, an NR-PUCCH, anNR-PRACH, and the like.

The NR physical uplink signal includes an NR-UL-RS. The NR-UL-RSincludes an NR-UL-DMRS, an NR-SRS, and the like.

The NR physical sidelink channel includes an NR-PSBCH, an NR-PSCCH, anNR-PSDCH, an NR-PSSCH, and the like.

<Downlink Physical Channel in Present Embodiment>

The PBCH is used to broadcast a master information block (MIB) which isbroadcast information specific to a serving cell of the base stationdevice 1. The PBCH is transmitted only through the sub frame 0 in theradio frame. The MIB can be updated at intervals of 40 ms. The PBCH isrepeatedly transmitted with a cycle of 10 ms. Specifically, initialtransmission of the MIB is performed in the sub frame 0 in the radioframe satisfying a condition that a remainder obtained by dividing asystem frame number (SFN) by 4 is 0, and retransmission (repetition) ofthe MIB is performed in the sub frame 0 in all the other radio frames.The SFN is a radio frame number (system frame number). The MIB is systeminformation. For example, the MIB includes information indicating theSFN.

The PCFICH is used to transmit information related to the number of OFDMsymbols used for transmission of the PDCCH. A region indicated by PCFICHis also referred to as a PDCCH region. The information transmittedthrough the PCFICH is also referred to as a control format indicator(CFI).

The PHICH is used to transmit an HARQ-ACK (an HARQ indicator, HARQfeedback, response information, and HARQ (Hybrid Automatic Repeatrequest)) indicating ACKnowledgment (ACK) or negative ACKnowledgment(NACK) of uplink data (an uplink shared channel (UL-SCH)) received bythe base station device 1. For example, in a case in which the HARQ-ACKindicating ACK is received by the terminal device 2, correspondinguplink data is not retransmitted. For example, in a case in which theterminal device 2 receives the HARQ-ACK indicating NACK, the terminaldevice 2 retransmits corresponding uplink data through a predetermineduplink sub frame. A certain PHICH transmits the HARQ-ACK for certainuplink data. The base station device 1 transmits each HARQ-ACK to aplurality of pieces of uplink data included in the same PUSCH using aplurality of PHICHs.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). Mapping of an information bit of the downlink controlinformation is defined as a DCI format. The downlink control informationincludes a downlink grant and an uplink grant. The downlink grant isalso referred to as a downlink assignment or a downlink allocation.

The PDCCH is transmitted by a set of one or more consecutive controlchannel elements (CCEs). The CCE includes 9 resource element groups(REGs). An REG includes 4 resource elements. In a case in which thePDCCH is constituted by n consecutive CCEs, the PDCCH starts with a CCEsatisfying a condition that a remainder after dividing an index (number)i of the CCE by n is 0.

The EPDCCH is transmitted by a set of one or more consecutive enhancedcontrol channel elements (ECCEs). The ECCE is constituted by a pluralityof enhanced resource element groups (EREGs).

The downlink grant is used for scheduling of the PDSCH in a certaincell. The downlink grant is used for scheduling of the PDSCH in the samesub frame as a sub frame in which the downlink grant is transmitted. Theuplink grant is used for scheduling of the PUSCH in a certain cell. Theuplink grant is used for scheduling of a single PUSCH in a fourth subframe from a sub frame in which the uplink grant is transmitted orlater.

A cyclic redundancy check (CRC) parity bit is added to the DCI. The CRCparity bit is scrambled using a radio network temporary identifier(RNTI). The RNTI is an identifier that can be specified or set inaccordance with a purpose of the DCI or the like. The RNTI is anidentifier specified in a specification in advance, an identifier set asinformation specific to a cell, an identifier set as informationspecific to the terminal device 2, or an identifier set as informationspecific to a group to which the terminal device 2 belongs. For example,in monitoring of the PDCCH or the EPDCCH, the terminal device 2descrambles the CRC parity bit added to the DCI with a predeterminedRNTI and identifies whether or not the CRC is correct. In a case inwhich the CRC is correct, the DCI is understood to be a DCI for theterminal device 2.

The PDSCH is used to transmit downlink data (a downlink shared channel(DL-SCH)). Further, the PDSCH is also used to transmit controlinformation of a higher layer.

The PMCH is used to transmit multicast data (a multicast channel (MCH)).

In the PDCCH region, a plurality of PDCCHs may be multiplexed accordingto frequency, time, and/or space. In the EPDCCH region, a plurality ofEPDCCHs may be multiplexed according to frequency, time, and/or space.In the PDSCH region, a plurality of PDSCHs may be multiplexed accordingto frequency, time, and/or space. The PDCCH, the PDSCH, and/or theEPDCCH may be multiplexed according to frequency, time, and/or space.

<Downlink Physical Signal in Present Embodiment>

A synchronization signal is used for the terminal device 2 to obtaindownlink synchronization in the frequency domain and/or the time domain.The synchronization signal includes a primary synchronization signal(PSS) and a secondary synchronization signal (SSS). The synchronizationsignal is placed in a predetermined sub frame in the radio frame. Forexample, in the TDD scheme, the synchronization signal is placed in thesub frames 0, 1, 5, and 6 in the radio frame. In the FDD scheme, thesynchronization signal is placed in the sub frames 0 and 5 in the radioframe.

The PSS may be used for coarse frame/symbol timing synchronization(synchronization in the time domain) or identification of a cellidentification group. The SSS may be used for more accurate frame timingsynchronization, cell identification, or CP length detection. In otherwords, frame timing synchronization and cell identification can beperformed using the PSS and the SSS.

The downlink reference signal is used for the terminal device 2 toperform propagation path estimation of the downlink physical channel,propagation path correction, calculation of downlink channel stateinformation (CSI), and/or measurement of positioning of the terminaldevice 2.

The CRS is transmitted in the entire band of the sub frame. The CRS isused for receiving (demodulating) the PBCH, the PDCCH, the PHICH, thePCFICH, and the PDSCH. The CRS may be used for the terminal device 2 tocalculate the downlink channel state information. The PBCH, the PDCCH,the PHICH, and the PCFICH are transmitted through the antenna port usedfor transmission of the CRS. The CRS supports the antenna portconfigurations of 1, 2, or 4. The CRS is transmitted through one or moreof the antenna ports 0 to 3.

The URS associated with the PDSCH is transmitted through a sub frame anda band used for transmission of the PDSCH with which the URS isassociated. The URS is used for demodulation of the PDSCH to which theURS is associated. The URS associated with the PDSCH is transmittedthrough one or more of the antenna ports 5 and 7 to 14.

The PDSCH is transmitted through an antenna port used for transmissionof the CRS or the URS on the basis of the transmission mode and the DCIformat. A DCI format IA is used for scheduling of the PDSCH transmittedthrough an antenna port used for transmission of the CRS. A DCI format2D is used for scheduling of the PDSCH transmitted through an antennaport used for transmission of the URS.

The DMRS associated with the EPDCCH is transmitted through a sub frameand a band used for transmission of the EPDCCH to which the DMRS isassociated. The DMRS is used for demodulation of the EPDCCH with whichthe DMRS is associated. The EPDCCH is transmitted through an antennaport used for transmission of the DMRS. The DMRS associated with theEPDCCH is transmitted through one or more of the antenna ports 107 to114.

The CSI-RS is transmitted through a set sub frame. The resources inwhich the CSI-RS is transmitted are set by the base station device 1.The CSI-RS is used for the terminal device 2 to calculate the downlinkchannel state information. The terminal device 2 performs signalmeasurement (channel measurement) using the CSI-RS. The CSI-RS supportssetting of some or all of the antenna ports 1, 2, 4, 8, 12, 16, 24, and32. The CSI-RS is transmitted through one or more of the antenna ports15 to 46. Further, an antenna port to be supported may be decided on thebasis of a terminal device capability of the terminal device 2, settingof an RRC parameter, and/or a transmission mode to be set.

Resources of the ZP CSI-RS are set by a higher layer. Resources of theZP CSI-RS maxy be transmitted with zero output power. In other words,the resources of the ZP CSI-RS may transmit nothing. The ZP PDSCH andthe EPDCCH are not transmitted in the resources in which the ZP CSI-RSis set. For example, the resources of the ZP CSI-RS are used for aneighbor cell to transmit the NZP CSI-RS. Further, for example, theresources of the ZP CSI-RS are used to measure the CSI-IM. Further, forexample, the resources of the ZP CSI-RS are resources with which apredetermined channel such as the PDSCH is not transmitted. In otherwords, the predetermined channel is mapped (to be rate-matched orpunctured) except for the resources of the ZP CSI-RS.

<Uplink Physical Signal in Present Embodiment>

The PUCCH is a physical channel used for transmitting uplink controlinformation (UCI). The uplink control information includes downlinkchannel state information (CSI), a scheduling request (SR) indicating arequest for PUSCH resources, and a HARQ-ACK to downlink data (atransport block (TB) or a downlink-shared channel (DL-SCH)). TheHARQ-ACK is also referred to as ACKINACK, HARQ feedback, or responseinformation. Further, the HARQ-ACK to downlink data indicates ACK, NACK,or DTX.

The PUSCH is a physical channel used for transmitting uplink data(uplink-shared channel (UL-SCH)). Further, the PUSCH may be used totransmit the HARQ-ACK and/or the channel state information together withuplink data. Further, the PUSCH may be used to transmit only the channelstate information or only the HARQ-ACK and the channel stateinformation.

The PRACH is a physical channel used for transmitting a random accesspreamble. The PRACH can be used for the terminal device 2 to obtainsynchronization in the time domain with the base station device 1.Further, the PRACH is also used to indicate an initial connectionestablishment procedure (process), a handover procedure, a connectionre-establishment procedure, synchronization (timing adjustment) foruplink transmission, and/or a request for PUSCH resources.

In the PUCCH region, a plurality of PUCCHs is frequency, time, space,and/or code multiplexed. In the PUSCH region, a plurality of PUSCHs maybe frequency, time, space, and/or code multiplexed. The PUCCH and thePUSCH may be frequency, time, space, and/or code multiplexed. The PRACHmay be placed over a single sub frame or two sub frames. A plurality ofPRACHs may be code-multiplexed.

<Physical Resources for Control Channel in Present Embodiment>

A resource element group (REG) is used to define mapping of the resourceelement and the control channel. For example, the REG is used formapping of the PDCCH, the PHICH, or the PCFICH. The REG is constitutedby four consecutive resource elements which are in the same OFDM symboland not used for the CRS in the same resource block. Further, the REG isconstituted by first to fourth OFDM symbols in a first slot in a certainsub frame.

An enhanced resource element group (EREG) is used to define mapping ofthe resource elements and the enhanced control channel. For example, theEREG is used for mapping of the EPDCCH. One resource block pair isconstituted by 16 EREGs. Each EREG is assigned the number of 0 to 15 foreach resource block pair. Each EREG is constituted by 9 resourceelements excluding resource elements used for the DM-RS associated withthe EPDCCH in one resource block pair.

<1.4. Configuration> <Configuration Example of Base Station Device 1 inPresent Embodiment>

FIG. 8 is a schematic block diagram illustrating a configuration of thebase station device 1 of the present embodiment. As illustrated, thebase station device 1 includes a higher layer processing unit 101, acontrol unit 103, a receiving unit 105, a transmitting unit 107, and atransceiving antenna 109. Further, the receiving unit 105 includes adecoding unit 1051, a demodulating unit 1053, a demultiplexing unit1055, a wireless receiving unit 1057, and a channel measuring unit 1059.Further, the transmitting unit 107 includes an encoding unit 1071, amodulating unit 1073, a multiplexing unit 1075, a wireless transmittingunit 1077, and a dow nlink reference signal generating unit 1079.

As described above, the base station device 1 can support one or moreRATs. Some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance withthe RAT. For example, the receiving unit 105 and the transmitting unit107 are configured individually in LTE and NR. Further, in the NR cell,some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance witha parameter set related to the transmission signal. For example, in acertain NR cell, the wireless receiving unit 1057 and the wirelesstransmitting unit 1077 can be configured individually in accordance witha parameter set related to the transmission signal.

The higher layer processing unit 101 performs processes of a mediumaccess control (MAC) layer, a packet data convergence protocol (PDCP)layer, a radio link control (RLC) layer, and a radio resource control(RRC) layer. Further, the higher layer processing unit 101 generatescontrol information to control the receiving unit 105 and thetransmitting unit 107 and outputs the control information to the controlunit 103.

The control unit 103 controls the receiving unit 105 and thetransmitting unit 107 on the basis of the control information from thehigher layer processing unit 101. The control unit 103 generates controlinformation to be transmitted to the higher layer processing unit 101and outputs the control information to the higher layer processing unit101. The control unit 103 receives a decoded signal from the decodingunit 1051 and a channel estimation result from the channel measuringunit 1059. The control unit 103 outputs a signal to be encoded to theencoding unit 1071. Further, the control unit 103 is used to control thewhole or a part of the base station device 1.

The higher layer processing unit 101 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control. The process and themanagement in the higher layer processing unit 101 are performed foreach terminal device or in common to terminal devices connected to thebase station device. The process and the management in the higher layerprocessing unit 101 may be performed only by the higher layer processingunit 101 or may be acquired from a higher node or another base stationdevice. Further, the process and the management in the higher layerprocessing unit 101 may be individually performed in accordance with theRAT. For example, the higher layer processing unit 101 individuallyperforms the process and the management in LTE and the process and themanagement in NR.

Under the RAT control of the higher layer processing unit 101,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 101,generation and/or management of downlink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In a sub frame setting in the higher layer processing unit 101,management of a sub frame setting, a sub frame pattern setting, anuplink-downlink setting, an uplink reference UL-DL setting, and/or adownlink reference UL-DL setting is performed. Further, the sub framesetting in the higher layer processing unit 101 is also referred to as abase station sub frame setting. Further, the sub frame setting in thehigher layer processing unit 101 can be decided on the basis of anuplink traffic volume and a downlink traffic volume. Further, the subframe setting in the higher layer processing unit 101 can be decided onthe basis of a scheduling result of scheduling control in the higherlayer processing unit 101.

In the scheduling control in the higher layer processing unit 101, afrequency and a sub frame to which the physical channel is allocated, acoding rate, a modulation scheme, and transmission power of the physicalchannels, and the like are decided on the basis of the received channelstate information, an estimation value, a channel quality, or the likeof a propagation path input from the channel measuring unit 1059, andthe like. For example, the control unit 103 generates the controlinformation (DCI format) on the basis of the scheduling result of thescheduling control in the higher layer processing unit 101.

In the CSI report control in the higher layer processing unit 101, theCSI report of the terminal device 2 is controlled. For example, asettings related to the CSI reference resources assumed to calculate theCSI in the terminal device 2 is controlled.

Under the control from the control unit 103, the receiving unit 105receives a signal transmitted from the terminal device 2 via thetransceiving antenna 109, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 103.Further, the reception process in the receiving unit 105 is performed onthe basis of a setting which is specified in advance or a settingnotified from the base station device 1 to the terminal device 2.

The wireless receiving unit 1057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 109.

The demultiplexing unit 1055 separates the uplink channel such as thePUCCH or the PUSCH and/or uplink reference signal from the signal inputfrom the wireless receiving unit 1057. The demultiplexing unit 1055outputs the uplink reference signal to the channel measuring unit 1059.The demultiplexing unit 1055 compensates the propagation path for theuplink channel from the estimation value of the propagation path inputfrom the channel measuring unit 1059.

The demodulating unit 1053 demodulates the reception signal for themodulation symbol of the uplink channel using a modulation scheme suchas binary phase shift keying (BPSK), quadrature phase shift keying(QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, or 256 QAM.The demodulating unit 1053 performs separation and demodulation of aMIMO multiplexed uplink channel.

The decoding unit 1051 performs a decoding process on encoded bits ofthe demodulated uplink channel. The decoded uplink data and/or uplinkcontrol information are output to the control unit 103. The decodingunit 1051 performs a decoding process on the PUSCH for each transportblock.

The channel measuring unit 1059 measures the estimation value, a channelquality, and/or the like of the propagation path from the uplinkreference signal input from the demultiplexing unit 1055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 1055 and/or the control unit103. For example, the estimation value of the propagation path forpropagation path compensation for the PUCCH or the PUSCH is measured bythe channel measuring unit 1059 using the UL-DMRS, and an uplink channelquality is measured using the SRS.

The transmitting unit 107 carries out a transmission process such asencoding, modulation, and multiplexing on downlink control informationand downlink data input from the higher layer processing unit 101 underthe control of the control unit 103. For example, the transmitting unit107 generates and multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal and generates a transmissionsignal. Further, the transmission process in the transmitting unit 107is performed on the basis of a setting which is specified in advance, asetting notified from the base station device 1 to the terminal device2, or a setting notified through the PDCCH or the EPDCCH transmittedthrough the same sub frame.

The encoding unit 1071 encodes the HARQ indicator (HARQ-ACK), thedownlink control information, and the downlink data input from thecontrol unit 103 using a predetermined coding scheme such as blockcoding, convolutional coding, turbo coding, or the like. The modulatingunit 1073 modulates the encoded bits input from the encoding unit 1071using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64QAM, or 256 QAM. The downlink reference signal generating unit 1079generates the downlink reference signal on the basis of a physical cellidentification (PCI), an RRC parameter set in the terminal device 2, andthe like. The multiplexing unit 1075 multiplexes a modulated symbol andthe downlink reference signal of each channel and arranges resultingdata in a predetermined resource element.

The wireless transmitting unit 1077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 1075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 1077 istransmitted through the transceiving antenna 109.

<Configuration Example of Base Station Device 2 in Present Embodiment>

FIG. 9 is a schematic block diagram illustrating a configuration of theterminal device 2 of the present embodiment. As illustrated, theterminal device 2 includes a higher layer processing unit 201, a controlunit 203, a receiving unit 205, a transmitting unit 207, and atransceiving antenna 209. Further, the receiving unit 205 includes adecoding unit 2051, a demodulating unit 2053, a demultiplexing unit2055, a wireless receiving unit 2057, and a channel measuring unit 2059.Further, the transmitting unit 207 includes an encoding unit 2071, amodulating unit 2073, a multiplexing unit 2075, a wireless transmittingunit 2077, and an uplink reference signal generating unit 2079.

As described above, the terminal device 2 can support one or more RATs.Some or all of the units included in the terminal device 2 illustratedin FIG. 9 can be configured individually in accordance with the RAT. Forexample, the receiving unit 205 and the transmitting unit 207 areconfigured individually in LTE and NR. Further, in the NR cell, some orall of the units included in the terminal device 2 illustrated in FIG. 9can be configured individually in accordance with a parameter setrelated to the transmission signal. For example, in a certain NR cell,the wireless receiving unit 2057 and the wireless transmitting unit 2077can be configured individually in accordance with a parameter setrelated to the transmission signal.

The higher layer processing unit 201 outputs uplink data (transportblock) to the control unit 203. The higher layer processing unit 201performs processes of a medium access control (MAC) layer, a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda radio resource control (RRC) layer. Further, the higher layerprocessing unit 201 generates control information to control thereceiving unit 205 and the transmitting unit 207 and outputs the controlinformation to the control unit 203.

The control unit 203 controls the receiving unit 205 and thetransmitting unit 207 on the basis of the control information from thehigher layer processing unit 201. The control unit 203 generates controlinformation to be transmitted to the higher layer processing unit 201and outputs the control information to the higher layer processing unit201. The control unit 203 receives a decoded signal from the decodingunit 2051 and a channel estimation result from the channel measuringunit 2059. The control unit 203 outputs a signal to be encoded to theencoding unit 2071. Further, the control unit 203 may be used to controlthe whole or a part of the terminal device 2.

The higher layer processing unit 201 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control. The process and themanagement in the higher layer processing unit 201 are performed on thebasis of a setting which is specified in advance and/or a setting basedon control information set or notified from the base station device 1.For example, the control information from the base station device 1includes the RRC parameter, the MAC control element, or the DCI.Further, the process and the management in the higher layer processingunit 201 may be individually performed in accordance with the RAT. Forexample, the higher layer processing unit 201 individually performs theprocess and the management in LTE and the process and the management inNR.

Under the RAT control of the higher layer processing unit 201,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 201,the setting information in the terminal device 2 is managed. In theradio resource control in the higher layer processing unit 201,generation and/or management of uplink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In the sub frame setting in the higher layer processing unit 201, thesub frame setting in the base station device 1 and/or a base stationdevice different from the base station device 1 is managed. The subframe setting includes an uplink or downlink setting for the sub frame,a sub frame pattern setting, an uplink-downlink setting, an uplinkreference UL-DL setting, and/or a downlink reference UL-DL setting.Further, the sub frame setting in the higher layer processing unit 201is also referred to as a terminal sub frame setting.

In the scheduling control in the higher layer processing unit 201,control information for controlling scheduling on the receiving unit 205and the transmitting unit 207 is generated on the basis of the DCI(scheduling information) from the base station device 1.

In the CSI report control in the higher layer processing unit 201,control related to the report of the CSI to the base station device 1 isperformed. For example, in the CSI report control, a setting related tothe CSI reference resources assumed for calculating the CSI by thechannel measuring unit 2059 is controlled. In the CSI report control,resource (timing) used for reporting the CSI is controlled on the basisof the DCI and/or the RRC parameter.

Under the control from the control unit 203, the receiving unit 205receives a signal transmitted from the base station device 1 via thetransceiving antenna 209, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 203.Further, the reception process in the receiving unit 205 is performed onthe basis of a setting which is specified in advance or a notificationfrom the base station device 1 or a setting.

The wireless receiving unit 2057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 209.

The demultiplexing unit 2055 separates the downlink channel such as thePHICH, PDCCH, EPDCCH, or PDSCH, downlink synchronization signal and/ordownlink reference signal from the signal input from the wirelessreceiving unit 2057. The demultiplexing unit 2055 outputs the uplinkreference signal to the channel measuring unit 2059. The demultiplexingunit 2055 compensates the propagation path for the uplink channel fromthe estimation value of the propagation path input from the channelmeasuring unit 2059.

The demodulating unit 2053 demodulates the reception signal for themodulation symbol of the downlink channel using a modulation scheme suchas BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The demodulating unit 2053performs separation and demodulation of a MIMO multiplexed downlinkchannel.

The decoding unit 2051 performs a decoding process on encoded bits ofthe demodulated downlink channel. The decoded downlink data and/ordownlink control information are output to the control unit 203. Thedecoding unit 2051 performs a decoding process on the PDSCH for eachtransport block.

The channel measuring unit 2059 measures the estimation value, a channelquality, and/or the like of the propagation path from the downlinkreference signal input from the demultiplexing unit 2055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 2055 and/or the control unit203. The downlink reference signal used for measurement by the channelmeasuring unit 2059 may be decided on the basis of at least atransmission mode set by the RRC parameter and/or other RRC parameters.For example, the estimation value of the propagation path for performingthe propagation path compensation on the PDSCH or the EPDCCH is measuredthrough the DL-DMRS. The estimation value of the propagation path forperforming the propagation path compensation on the PDCCH or the PDSCHand/or the downlink channel for reporting the CSI are measured throughthe CRS. The downlink channel for reporting the CSI is measured throughthe CSI-RS. The channel measuring unit 2059 calculates a referencesignal received power (RSRP) and/or a reference signal received quality(RSRQ) on the basis of the CRS, the CSI-RS, or the discovery signal, andoutputs the RSRP and/or the RSRQ to the higher layer processing unit201.

The transmitting unit 207 performs a transmission process such asencoding, modulation, and multiplexing on the uplink control informationand the uplink data input from the higher layer processing unit 201under the control of the control unit 203. For example, the transmittingunit 207 generates and multiplexes the uplink channel such as the PUSCHor the PUCCH and/or the uplink reference signal, and generates atransmission signal. Further, the transmission process in thetransmitting unit 207 is performed on the basis of a setting which isspecified in advance or a setting set or notified from the base stationdevice 1.

The encoding unit 2071 encodes the HARQ indicator (HARQ-ACK), the uplinkcontrol information, and the uplink data input from the control unit 203using a predetermined coding scheme such as block coding, convolutionalcoding, turbo coding, or the like. The modulating unit 2073 modulatesthe encoded bits input from the encoding unit 2071 using a predeterminedmodulation scheme such as BPSK. QPSK, 16 QAM, 64 QAM, or 256 QAM. Theuplink reference signal generating unit 2079 generates the uplinkreference signal on the basis of an RRC parameter set in the terminaldevice 2, and the like. The multiplexing unit 2075 multiplexes amodulated symbol and the uplink reference signal of each channel andarranges resulting data in a predetermined resource element.

The wireless transmitting unit 2077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 2075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 2077 istransmitted through the transceiving antenna 209.

<1.5. Control Information and Control Channel> <Signaling of ControlInformation in Present Embodiment>

The base station device 1 and the terminal device 2 can use variousmethods for signaling (notification, broadcasting, or setting) of thecontrol information. The signaling of the control information can beperformed in various layers (layers). The signaling of the controlinformation includes signaling of the physical layer which is signalingperformed through the physical layer, RRC signaling which is signalingperformed through the RRC layer, and MAC signaling which is signalingperformed through the MAC layer. The RRC signaling is dedicated RRCsignaling for notifying the terminal device 2 of the control informationspecific or a common RRC signaling for notifying of the controlinformation specific to the base station device 1. The signaling used bya layer higher than the physical layer such as RRC signaling and MACsignaling is also referred to as signaling of the higher layer.

The RRC signaling is implemented by signaling the RRC parameter. The MACsignaling is implemented by signaling the MAC control element. Thesignaling of the physical layer is implemented by signaling the downlinkcontrol information (DCI) or the uplink control information (UCI). TheRRC parameter and the MAC control element are transmitted using thePDSCH or the PUSCH. The DCI is transmitted using the PDCCH or theEPDCCH. The UCI is transmitted using the PUCCH or the PUSCH. The RRCsignaling and the MAC signaling are used for signaling semi-staticcontrol information and are also referred to as semi-static signaling.The signaling of the physical layer is used for signaling dynamiccontrol information and also referred to as dynamic signaling. The DCIis used for scheduling of the PDSCH or scheduling of the PUSCH. The UCIis used for the CSI report, the HARQ-ACK report, and/or the schedulingrequest (SR).

<Details of Downlink Control Information in Present Embodiment>

The DCI is notified using the DCI format having a field which isspecified in advance. Predetermined information bits are mapped to thefield specified in the DCI format. The DCI notifies of downlinkscheduling information, uplink scheduling information, sidelinkscheduling information, a request for a non-periodic CSI report, or anuplink transmission power command.

The DCI format monitored by the terminal device 2 is decided inaccordance with the transmission mode set for each serving cell. Inother words, a part of the DCI format monitored by the terminal device 2can differ depending on the transmission mode. For example, the terminaldevice 2 in which a downlink transmission mode 1 is set monitors the DCIformat IA and the DCI format 1. For example, the terminal device 2 inwhich a downlink transmission mode 4 is set monitors the DCI format IAand the DCI format 2. For example, the terminal device 2 in which anuplink transmission mode 1 is set monitors the DCI format 0. Forexample, the terminal device 2 in which an uplink transmission mode 2 isset monitors the DCI format 0 and the DCI format 4.

A control region in which the PDCCH for notifying the terminal device 2of the DCI is placed is not notified of, and the terminal device 2detects the DCI for the terminal device 2 through blind decoding (blinddetection). Specifically, the terminal device 2 monitors a set of PDCCHcandidates in the serving cell. The monitoring indicates that decodingis attempted in accordance with all the DCI formats to be monitored foreach of the PDCCHs in the set. For example, the terminal device 2attempts to decode all aggregation levels, PDCCH candidates, and DCIformats which are likely to be transmitted to the terminal device 2. Theterminal device 2 recognizes the DCI (PDCCH) which is successfullydecoded (detected) as the DCI (PDCCH) for the terminal device 2.

A cyclic redundancy check (CRC) is added to the DCI. The CRC is used forthe DCI error detection and the DCI blind detection. A CRC parity bit(CRC) is scrambled using the RNTI. The terminal device 2 detects whetheror not it is a DCI for the terminal device 2 on the basis of the RNTI.Specifically, the terminal device 2 performs de-scrambling on the bitcorresponding to the CRC using a predetermined RNTI, extracts the CRC,and detects whether or not the corresponding DCI is correct.

The RNTI is specified or set in accordance with a purpose or a use ofthe DCI. The RNTI includes a cell-RNTI (C-RNTI), a semi persistentscheduling C-RNTI (SPS C-RNTI), a system information-RNTI (SI-RNTI), apaging-RNTI (P-RNTI), a random access-RNTI (RA-RNTI), a transmit powercontrol-PUCCH-RNTI (TPC-PUCCH-RNTI), a transmit power control-PUSCH-RNTI(TPC-PUSCH-RNTI), a temporary C-RNTI, a multimedia broadcast multicastservices (MBMS)-RNTI (M-RNTI)), an eIMTA-RNTI and a CC-RNTI.

The C-RNTI and the SPS C-RNTI are RNTIs which are specific to theterminal device 2 in the base station device 1 (cell), and serve asidentifiers identifying the terminal device 2. The C-RNTI is used forscheduling the PDSCH or the PUSCH in a certain sub frame. The SPS C-RNTIis used to activate or release periodic scheduling of resources for thePDSCH or the PUSCH. A control channel having a CRC scrambled using theSI-RNTI is used for scheduling a system information block (SIB). Acontrol channel with a CRC scrambled using the P-RNTI is used forcontrolling paging. A control channel with a CRC scrambled using theRA-RNTI is used for scheduling a response to the RACH. A control channelhaving a CRC scrambled using the TPC-PUCCH-RNTI is used for powercontrol of the PUCCH. A control channel having a CRC scrambled using theTPC-PUSCH-RNTI is used for power control of the PUSCH. A control channelwith a CRC scrambled using the temporary C-RNTI is used by a mobilestation device in which no C-RNTI is set or recognized. A controlchannel with CRC scrambled using the M-RNTI is used for scheduling theMBMS. A control channel with a CRC scrambled using the eIMTA-RNTI isused for notifying of information related to a TDD UL/DL setting of aTDD serving cell in dynamic TDD (eIMTA). The control channel (DCI) witha CRC scrambled using the CC-RNTI is used to notify of setting of anexclusive OFDM symbol in the LAA secondary cell. Further, the DCI formatmay be scrambled using a new RNTI instead of the above RNTI.

Scheduling information (the downlink scheduling information, the uplinkscheduling information, and the sidelink scheduling information)includes information for scheduling in units of resource blocks orresource block groups as the scheduling of the frequency region. Theresource block group is successive resource block sets and indicatesresources allocated to the scheduled terminal device. A size of theresource block group is decided in accordance with a system bandwidth.

<Details of Downlink Control Channel in Present Embodiment>

The DCI is transmitted using a control channel such as the PDCCH or theEPDCCH. The terminal device 2 monitors a set of PDCCH candidates and/ora set of EPDCCH candidates of one or more activated serving cells set byRRC signaling. Here, the monitoring means that the PDCCH and/or theEPDCCH in the set corresponding to all the DCI formats to be monitoredis attempted to be decoded.

A set of PDCCH candidates or a set of EPDCCH candidates is also referredto as a search space. In the search space, a shared search space (CSS)and a terminal specific search space (USS) are defined. The CSS may bedefined only for the search space for the PDCCH.

A common search space (CSS) is a search space set on the basis of aparameter specific to the base station device 1 and/or a parameter whichis specified in advance. For example, the CSS is a search space used incommon to a plurality of terminal devices. Therefore, the base stationdevice 1 maps a control channel common to a plurality of terminaldevices to the CSS, and thus resources for transmitting the controlchannel are reduced.

A UE-specific search space (USS) is a search space set using at least aparameter specific to the terminal device 2. Therefore, the USS is asearch space specific to the terminal device 2, and it is possible forthe base station device 1 to individually transmit the control channelspecific to the terminal device 2 by using the USS. For this reason, thebase station device 1 can efficiently map the control channels specificto a plurality of terminal devices.

The USS may be set to be used in common to a plurality of terminaldevices. Since a common USS is set in a plurality of terminal devices, aparameter specific to the terminal device 2 is set to be the same valueamong a plurality of terminal devices. For example, a unit set to thesame parameter among a plurality of terminal devices is a cell, atransmission point, a group of predetermined terminal devices, or thelike.

The search space of each aggregation level is defined by a set of PDCCHcandidates. Each PDCCH is transmitted using one or more CCE sets. Thenumber of CCEs used in one PDCCH is also referred to as an aggregationlevel. For example, the number of CCEs used in one PDCCH is 1, 2, 4, or8.

The search space of each aggregation level is defined by a set of EPDCCHcandidates. Each EPDCCH is transmitted using one or more enhancedcontrol channel element (ECCE) sets. The number of ECCEs used in oneEPDCCH is also referred to as an aggregation level. For example, thenumber of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or 32.

The number of PDCCH candidates or the number of EPDCCH candidates isdecided on the basis of at least the search space and the aggregationlevel. For example, in the CSS, the number of PDCCH candidates in theaggregation levels 4 and 8 are 4 and 2, respectively. For example, inthe USS, the number of PDCCH candidates in the aggregations 1, 2, 4, and8 are 6, 6, 2, and 2, respectively.

Each ECCE includes a plurality of EREGs. The EREG is used to definemapping to the resource element of the EPDCCH. 16 EREGs which areassigned numbers of 0 to 15 are defined in each RB pair. In other words,an EREG 0 to an EREG 15 are defined in each RB pair. For each RB pair,the EREG 0 to the EREG 15 are preferentially defined at regularintervals in the frequency direction for resource elements other thanresource elements to which a predetermined signal and/or channel ismapped. For example, a resource element to which a demodulationreference signal associated with an EPDCCH transmitted through antennaports 107 to 110 is mapped is not defined as the EREG

The number of ECCEs used in one EPDCCH depends on an EPDCCH format andis decided on the basis of other parameters. The number of ECCEs used inone EPDCCH is also referred to as an aggregation level. For example, thenumber of ECCEs used in one EPDCCH is decided on the basis of the numberof resource elements which can be used for transmission of the EPDCCH inone RB pair, a transmission method of the EPDCCH, and the like. Forexample, the number of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or32. Further, the number of EREGs used in one ECCE is decided on thebasis of a type of sub frame and a type of cyclic prefix and is 4 or 8.Distributed transmission and localized transmission are supported as thetransmission method of the EPDCCH.

The distributed transmission or the localized transmission can be usedfor the EPDCCH. The distributed transmission and the localizedtransmission differ in mapping of the ECCE to the EREG and the RB pair.For example, in the distributed transmission, one ECCE is configuredusing EREGs of a plurality of RB pairs. In the localized transmission,one ECCE is configured using an EREG of one RB pair.

The base station device 1 performs a setting related to the EPDCCH inthe terminal device 2. The terminal device 2 monitors a plurality ofEPDCCHs on the basis of the setting from the base station device 1. Aset of RB pairs that the terminal device 2 monitors the EPDCCH can beset. The set of RB pairs is also referred to as an EPDCCH set or anEPDCCH-PRB set. One or more EPDCCH sets can be set in one terminaldevice 2. Each EPDCCH set includes one or more RB pairs. Further, thesetting related to the EPDCCH can be individually performed for eachEPDCCH set.

The base station device 1 can set a predetermined number of EPDCCH setsin the terminal device 2. For example, up to two EPDCCH sets can be setas an EPDCCH set 0 and/or an EPDCCH set 1. Each of the EPDCCH sets canbe constituted by a predetermined number of RB pairs. Each EPDCCH setconstitutes one set of ECCEs. The number of ECCEs configured in oneEPDCCH set is decided on the basis of the number of RB pairs set as theEPDCCH set and the number of EREGs used in one ECCE. In a case in whichthe number of ECCEs configured in one EPDCCH set is N, each EPDCCH setconstitutes ECCEs 0 to N−1. For example, in a case in which the numberof EREGs used in one ECCE is 4, the EPDCCH set constituted by 4 RB pairsconstitutes 16 ECCEs.

<1.6. CA and DC> <Details of CA and DC in Present Embodiment>

A plurality of cells is set for the terminal device 2, and the terminaldevice 2 can perform multicarrier transmission. Communication in whichthe terminal device 2 uses a plurality of cells is referred to ascarrier aggregation (CA) or dual connectivity (DC). Contents describedin the present embodiment can be applied to each or some of a pluralityof cells set in the terminal device 2. The cell set in the terminaldevice 2 is also referred to as a serving cell.

In the CA, a plurality of serving cells to be set includes one primarycell (PCell) and one or more secondary cells (SCell). One primary celland one or more secondary cells can be set in the terminal device 2 thatsupports the CA.

The primary cell is a serving cell in which the initial connectionestablishment procedure is performed, a serving cell that the initialconnection re-establishment procedure is started, or a cell indicated asthe primary cell in a handover procedure. The primary cell operates witha primary frequency. The secondary cell can be set after a connection isconstructed or reconstructed. The secondary cell operates with asecondary frequency. Further, the connection is also referred to as anRRC connection.

The DC is an operation in which a predetermined terminal device 2consumes radio resources provided from at least two different networkpoints. The network point is a master base station device (a master eNB(MeNB)) and a secondary base station device (a secondary eNB (SeNB)). Inthe dual connectivity, the terminal device 2 establishes an RRCconnection through at least two network points. In the dualconnectivity, the two network points may be connected through anon-ideal backhaul.

In the DC, the base station device 1 which is connected to at least anS1-MME and plays a role of a mobility anchor of a core network isreferred to as a master base station device. Further, the base stationdevice 1 which is not the master base station device providingadditional radio resources to the terminal device 2 is referred to as asecondary base station device. A group of serving cells associated withthe master base station device is also referred to as a master cellgroup (MCG). A group of serving cells associated with the secondary basestation device is also referred to as a secondary cell group (SCG). Notethat the group of the serving cells is also referred to as a cell group(CG).

In the DC, the primary cell belongs to the MCG. Further, in the SCG thesecondary cell corresponding to the primary cell is referred to as aprimary secondary cell (PSCell). A function (capability and performance)equivalent to the PCell (the base station device constituting the PCell)may be supported by the PSCell (the base station device constituting thePSCell). Further, the PSCell may only support some functions of thePCell. For example, the PSCell may support a function of performing thePDCCH transmission using the search space different from the CSS or theUSS. Further, the PSCell may constantly be in an activation state.Further, the PSCell is a cell that can receive the PUCCH.

In the DC, a radio bearer (a date radio bearer (DRB)) and/or a signalingradio bearer (SRB) may be individually allocated through the MeNB andthe SeNB. A duplex mode may be set individually in each of the MCG(PCell) and the SCG (PSCell). The MCG (PCell) and the SCG (PSCell) maynot be synchronized with each other. That is, a frame boundary of theMCG and a frame boundary of the SCG may not be matched. A parameter (atiming advance group (TAG)) for adjusting a plurality of timings may beindependently set in the MCG (PCell) and the SCG (PSCell). In the dualconnectivity, the terminal device 2 transmits the UCI corresponding tothe cell in the MCG only through MeNB (PCell) and transmits the UCIcorresponding to the cell in the SCG only through SeNB (pSCell). In thetransmission of each UCI, the transmission method using the PUCCH and/orthe PUSCH is applied in each cell group.

The PUCCH and the PBCH (MIB) are transmitted only through the PCell orthe PSCell. Further, the PRACH is transmitted only through the PCell orthe PSCell as long as a plurality of TAGs is not set between cells inthe CG.

In the PCell or the PSCell, semi-persistent scheduling (SPS) ordiscontinuous transmission (DRX) may be performed. In the secondarycell, the same DRX as the PCell or the PSCell in the same cell group maybe performed.

In the secondary cell, information/parameter related to a setting of MACis basically shared with the PCell or the PSCell in the same cell group.Some parameters may be set for each secondary cell. Some timers orcounters may be applied only to the PCell or the PSCell.

In the CA, a cell to which the TDD scheme is applied and a cell to whichthe FDD scheme is applied may be aggregated. In a case in which the cellto which the TDD is applied and the cell to which the FDD is applied areaggregated, the present disclosure can be applied to either the cell towhich the TDD is applied or the cell to which the FDD is applied.

The terminal device 2 transmits information (supportedBandCombination)indicating a combination of bands in which the CA and/or DC is supportedby the terminal device 2 to the base station device 1. The terminaldevice 2 transmits information indicating whether or not simultaneoustransmission and reception are supported in a plurality of serving cellsin a plurality of different bands for each of band combinations to thebase station device 1.

<1.7. Resource Allocation> <Details of Resource Allocation in PresentEmbodiment>

The base station device 1 can use a plurality of methods as a method ofallocating resources of the PDSCH and/or the PUSCH to the terminaldevice 2. The resource allocation method includes dynamic scheduling,semi persistent scheduling, multi sub frame scheduling, and cross subframe scheduling.

In the dynamic scheduling, one DCI performs resource allocation in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in the sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in apredetermined sub frame after the certain sub frame.

In the multi sub frame scheduling, one DCI allocates resources in one ormore sub frames. Specifically, the PDCCH or the EPDCCH in a certain subframe performs scheduling for the PDSCH in one or more sub frames whichare a predetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in oneor more sub frames which are a predetermined number after the sub frame.The predetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the multi sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled. The number of sub frames to be scheduled may be specified inadvance or may be decided on the basis of the signaling of the physicallayer and/or the RRC signaling.

In the cross sub frame scheduling, one DCI allocates resources in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in one sub frame which is apredetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in onesub frame which is a predetermined number after the sub frame. Thepredetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the cross sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled.

In the semi-persistent scheduling (SPS), one DCI allocates resources inone or more sub frames. In a case in which information related to theSPS is set through the RRC signaling, and the PDCCH or the EPDCCH foractivating the SPS is detected, the terminal device 2 activates aprocess related to the SPS and receives a predetermined PDSCH and/orPUSCH on the basis of a setting related to the SPS. In a case in whichthe PDCCH or the EPDCCH for releasing the SPS is detected when the SPSis activated, the terminal device 2 releases (inactivates) the SPS andstops reception of a predetermined PDSCH and/or PUSCH. The release ofthe SPS may be performed on the basis of a case in which a predeterminedcondition is satisfied. For example, in a case in which a predeterminednumber of empty transmission data is received, the SPS is released. Thedata empty transmission for releasing the SPS corresponds to a MACprotocol data unit (PDU) including a zero MAC service data unit (SDU).

Information related to the SPS by the RRC signaling includes an SPSC-RNTI which is an SPN RNTI, information related to a period (interval)in which the PDSCH is scheduled, information related to a period(interval) in which the PUSCH is scheduled, information related to asetting for releasing the SPS, and/or the number of the HARQ process inthe SPS. The SPS is supported only in the primary cell and/or theprimary secondary cell.

<1.8. Error Correction> <HARQ in Present Embodiment>

In the present embodiment, the HARQ has various features. The HARQtransmits and retransmits the transport block. In the HARQ, apredetermined number of processes (HARQ processes) are used (set), andeach process independently operates in accordance with a stop-and-waitscheme.

In the downlink, the HARQ is asynchronous and operates adaptively. Inother words, in the downlink, retransmission is constantly scheduledthrough the PDCCH. The uplink HARQ-ACK (response information)corresponding to the downlink transmission is transmitted through thePUCCH or the PUSCH. In the downlink, the PDCCH notifies of a HARQprocess number indicating the HARQ process and information indicatingwhether or not transmission is initial transmission or retransmission.

In the uplink, the HARQ operates in a synchronous or asynchronousmanner. The downlink HARQ-ACK (response information) corresponding tothe uplink transmission is transmitted through the PHICH. In the uplinkHARQ, an operation of the terminal device is decided on the basis of theHARQ feedback received by the terminal device and/or the PDCCH receivedby the terminal device. For example, in a case in which the PDCCH is notreceived, and the HARQ feedback is ACK, the terminal device does notperform transmission (retransmission) but holds data in a HARQ buffer.In this case, the PDCCH may be transmitted in order to resume theretransmission. Further, for example, in a case in which the PDCCH isnot received, and the HARQ feedback is NACK, the terminal deviceperforms retransmission non-adaptively through a predetermined uplinksub frame. Further, for example, in a case in which the PDCCH isreceived, the terminal device performs transmission or retransmission onthe basis of contents notified through the PDCCH regardless of contentof the HARQ feedback.

Further, in the uplink, in a case in which a predetermined condition(setting) is satisfied, the HARQ may be operated only in an asynchronousmanner. In other words, the downlink HARQ-ACK is not transmitted, andthe uplink retransmission may constantly be scheduled through the PDCCH.

In the HARQ-ACK report, the HARQ-ACK indicates ACK, NACK, or DTX. In acase in which the HARQ-ACK is ACK, it indicates that the transport block(codeword and channel) corresponding to the HARQ-ACK is correctlyreceived (decoded). In a case in which the HARQ-ACK is NACK, itindicates that the transport block (codeword and channel) correspondingto the HARQ-ACK is not correctly received (decoded). In a case in whichthe HARQ-ACK is DTX, it indicates that the transport block (codeword andchannel) corresponding to the HARQ-ACK is not present (not transmitted).

A predetermined number of HARQ processes are set (specified) in each ofdownlink and uplink. For example, in FDD, up to eight HARQ processes areused for each serving cell. Further, for example, in TDD, a maximumnumber of HARQ processes is decided by an uplink/downlink setting. Amaximum number of HARQ processes may be decided on the basis of a roundtrip time (RTT). For example, in a case in which the RTT is 8 TTIs, themaximum number of the HARQ processes can be 8.

In the present embodiment, the HARQ information is constituted by atleast a new data indicator (NDI) and a transport block size (TBS). TheNDI is information indicating whether or not the transport blockcorresponding to the HARQ information is initial transmission orretransmission. The TBS is the size of the transport block. Thetransport block is a block of data in a transport channel (transportlayer) and can be a unit for performing the HARQ. In the DL-SCHtransmission, the HARQ information further includes a HARQ process ID (aHARQ process number). In the UL-SCH transmission, the HARQ informationfurther includes an information bit in which the transport block isencoded and a redundancy version (RV) which is information specifying aparity bit. In the case of spatial multiplexing in the DL-SCH, the HARQinformation thereof includes a set of NDI and TBS for each transportblock.

<1.9. Resource Element Mapping> <Details of LTE Downlink ResourceElement Mapping in Present Embodiment>

FIG. 10 is a diagram illustrating an example of LTE downlink resourceelement mapping in the present embodiment. In this example, a set ofresource elements in one resource block pair in a case in which oneresource block and the number of OFDM symbols in one slot are 7 will bedescribed. Further, seven OFDM symbols in a first half in the timedirection in the resource block pair are also referred to as a slot 0 (afirst slot). Seven OFDM symbols in a second half in the time directionin the resource block pair are also referred to as a slot 1 (a secondslot). Further, the OFDM symbols in each slot (resource block) areindicated by OFDM symbol number 0 to 6. Further, the sub carriers in thefrequency direction in the resource block pair are indicated by subcarrier numbers 0 to 11. Further, in a case in which a system bandwidthis constituted by a plurality of resource blocks, a different subcarrier number is allocated over the system bandwidth. For example, in acase in which the system bandwidth is constituted by six resourceblocks, the sub carriers to which the sub carrier numbers 0 to 71 areallocated are used. Further, in the description of the presentembodiment, a resource element (k, l) is a resource element indicated bya sub carrier number k and an OFDM symbol number 1.

Resource elements indicated by R 0 to R 3 indicate cell-specificreference signals of the antenna ports 0 to 3, respectively.Hereinafter, the cell-specific reference signals of the antenna ports 0to 3 are also referred to as cell-specific RSs (CRSs). In this example,the case of the antenna ports in which the number of CRSs is 4 isdescribed, but the number thereof can be changed. For example, the CRScan use one antenna port or two antenna ports. Further, the CRS canshift in the frequency direction on the basis of the cell ID. Forexample, the CRS can shift in the frequency direction on the basis of aremainder obtained by dividing the cell ID by 6.

Resource element indicated by C1 to C4 indicates reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. The resource elements denoted by C1 to C4 indicate CSI-RSs of aCDM group 1 to a CDM group 4, respectively. The CSI-RS is constituted byan orthogonal sequence (orthogonal code) using a Walsh code and ascramble code using a pseudo random sequence. Further, the CSI-RS iscode division multiplexed using an orthogonal code such as a Walsh codein the CDM group. Further, the CSI-RS is frequency-division multiplexed(FDM) mutually between the CDM groups.

The CSI-RSs of the antenna ports 15 and 16 are mapped to C1. The CSI-RSsof the antenna ports 17 and 18 is mapped to C2. The CSI-RSs of theantenna port 19 and 20 are mapped to C3. The CSI-RSs of the antenna port21 and 22 are mapped to C4.

A plurality of antenna ports of the CSI-RSs is specified. The CSI-RS canbe set as a reference signal corresponding to eight antenna ports of theantenna ports 15 to 22. Further, the CSI-RS can be set as a referencesignal corresponding to four antenna ports of the antenna ports 15 to18. Further, the CSI-RS can be set as a reference signal correspondingto two antenna ports of the antenna ports 15 to 16. Further, the CSI-RScan be set as a reference signal corresponding to one antenna port ofthe antenna port 15. The CSI-RS can be mapped to some sub frames, and,for example, the CSI-RS can be mapped for every two or more sub frames.A plurality of mapping patterns is specified for the resource element ofthe CSI-RS. Further, the base station device 1 can set a plurality ofCSI-RSs in the terminal device 2.

The CSI-RS can set transmission power to zero. The CSI-RS with zerotransmission power is also referred to as a zero power CSI-RS. The zeropower CSI-RS is set independently of the CSI-RS of the antenna ports 15to 22. Further, the CSI-RS of the antenna ports 15 to 22 is alsoreferred to as a non-zero power CSI-RS.

The base station device 1 sets CSI-RS as control information specific tothe terminal device 2 through the RRC signaling. In the terminal device2, the CSI-RS is set through the RRC signaling by the base stationdevice 1. Further, in the terminal device 2, the CSI-IM resources whichare resources for measuring interference power can be set. The terminaldevice 2 generates feedback information using the CRS, the CSI-RS,and/or the CSI-IM resources on the basis of a setting from the basestation device 1.

Resource elements indicated by D1 to D2 indicate the DL-DMRSs of the CDMgroup 1 and the CDM group 2, respectively. The DL-DMRS is constitutedusing an orthogonal sequence (orthogonal code) using a Walsh code and ascramble sequence according to a pseudo random sequence. Further, theDL-DMRS is independent for each antenna port and can be multiplexedwithin each resource block pair. The DL-DMRSs are in an orthogonalrelation with each other between the antenna ports in accordance withthe CDM and/or the FDM. Each of DL-DMRSs undergoes the CDM in the CDMgroup in accordance with the orthogonal codes. The DL-DMRSs undergo theFDM with each other between the CDM groups. The DL-DMRSs in the same CDMgroup are mapped to the same resource element. For the DL-DMRSs in thesame CDM group, different orthogonal sequences are used between theantenna ports, and the orthogonal sequences are in the orthogonalrelation with each other. The DL-DMRS for the PDSCH can use some or allof the eight antenna ports (the antenna ports 7 to 14). In other words,the PDSCH associated with the DL-DMRS can perform MIMO transmission ofup to 8 ranks. The DL-DMRS for the EPDCCH can use some or all of thefour antenna ports (the antenna ports 107 to 110). Further, the DL-DMRScan change a spreading code length of the CDM or the number of resourceelements to be mapped in accordance with the number of ranks of anassociated channel.

The DL-DMRS for the PDSCH to be transmitted through the antenna ports 7,8, 11, and 13 are mapped to the resource element indicated by D1. TheDL-DMRS for the PDSCH to be transmitted through the antenna ports 9, 10,12, and 14 are mapped to the resource element indicated by D2. Further,the DL-DMRS for the EPDCCH to be transmitted through the antenna ports107 and 108 are mapped to the resource element indicated by D1. TheDL-DMRS for the EPDCCH to be transmitted through the antenna ports 109and 110 are mapped to the resource element denoted by D2.

<Details of Downlink Resource Elements Mapping of NR in PresentEmbodiment>

FIG. 11 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 11illustrates a set of resource elements in the predetermined resources ina case in which parameter set 0 is used. The predetermined resourcesillustrated in FIG. 11 are resources formed by a time length and afrequency bandwidth such as one resource block pair in LTE.

In NR, the predetermined resource is referred to as an NR resource block(NR-RB). The predetermined resource can be used for a unit of allocationof the NR-PDSCH or the NR-PDCCH, a unit in which mapping of thepredetermined channel or the predetermined signal to a resource elementis defined, or a unit in which the parameter set is set.

In the example of FIG. 11, the predetermined resources include 14 OFDMsymbols indicated by OFDM symbol numbers 0 to 13 in the time directionand 12 sub carriers indicated by sub carrier numbers 0 to 11 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 12 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 12illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 12 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 12, the predetermined resources include 7 OFDMsymbols indicated by OFDM symbol numbers 0 to 6 in the time directionand 24 sub carriers indicated by sub carrier numbers 0 to 23 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 15 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 15illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 15 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 13, the predetermined resources include 28 OFDMsymbols indicated by OFDM symbol numbers 0 to 27 in the time directionand 6 sub carriers indicated by sub carrier numbers 0 to 6 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

<1.10. Self-Contained Transmission> <Details of Self-ContainedTransmission of NR in Present Embodiment>

In NR, a physical channel and/or a physical signal can be transmitted byself-contained transmission. FIG. 14 illustrates an example of a frameconfiguration of the self-contained transmission in the presentembodiment. In the self-contained transmission, single transceivingincludes successive downlink transmission, a GP, and successive downlinktransmission from the head in this order. The successive downlinktransmission includes at least one piece of downlink control informationand the DMRS. The downlink control information gives an instruction toreceive a downlink physical channel included in the successive downlinktransmission and to transmit an uplink physical channel included in thesuccessive uplink transmission. In a case in which the downlink controlinformation gives an instruction to receive the downlink physicalchannel, the terminal device 2 attempts to receive the downlink physicalchannel on the basis of the downlink control information. Then, theterminal device 2 transmits success or failure of reception of thedownlink physical channel (decoding success or failure) by an uplinkcontrol channel included in the uplink transmission allocated after theGP. On the other hand, in a case in which the downlink controlinformation gives an instruction to transmit the uplink physicalchannel, the uplink physical channel transmitted on the basis of thedownlink control information is included in the uplink transmission tobe transmitted. In this way, by flexibly switching between transmissionof uplink data and transmission of downlink data by the downlink controlinformation, it is possible to take countermeasures instantaneously toincrease or decrease a traffic ratio between an uplink and a downlink.Further, by notifying of the success or failure of the reception of thedownlink by the uplink transmission immediately after the success orfailure of reception of the downlink, it is possible to realizelow-delay communication of the downlink.

A unit slot time is a minimum time unit in which downlink transmission,a GP, or uplink transmission is defined. The unit slot time is reservedfor one of the downlink transmission, the GP, and the uplinktransmission. In the unit slot time, neither the downlink transmissionnor the uplink transmission is included. The unit slot time may be aminimum transmission time of a channel associated with the DMRS includedin the unit slot time. One unit slot time is defined as, for example, aninteger multiple of a sampling interval (T_(s)) or the symbol length ofNR.

The unit frame time may be a minimum time designated by scheduling. Theunit frame time may be a minimum unit in which a transport block istransmitted. The unit slot time may be a maximum transmission time of achannel associated with the DMRS included in the unit slot time. Theunit frame time may be a unit time in which the uplink transmissionpower in the terminal device 2 is decided. The unit frame time may bereferred to as a sub frame. In the unit frame time, there are threetypes of only the downlink transmission, only the uplink transmission,and a combination of the uplink transmission and the downlinktransmission. One unit frame time is defined as, for example, an integermultiple of the sampling interval (T_(s)), the symbol length, or theunit slot time of NR.

A transceiving time is one transceiving time. A time (a gap) in whichneither the physical channel nor the physical signal is transmitted mayoccupy between one transceiving and another transceiving. The terminaldevice 2 may not average the CSI measurement between differenttransceiving. The transceiving time may be referred to as TTI. Onetransceiving time is defined as, for example, an integer multiple of thesampling interval (T_(s)), the symbol length, the unit slot time, or theunit frame time of NR.

<1.11. Technical Features> <Configuration of NR-PUCCH in PresentEmbodiment>

Hereinafter, a configuration of an NR-PUCCH will be described in thepresent embodiment.

First, the NR-PUCCH transmitted in a narrow bandwidth will be describedas an example of the configuration of the NR-PUCCH. Note that, in thefollowing description, this NR-PUCCH is also referred to as a “firstNR-PUCCH.” Specifically, the first NR-PUCCH is transmitted using all thesymbols in one resource block and sub frames. In this case, since thebandwidth is narrow, a reduction in transmission power such as PAPR canbe expected.

Further, the NR-PUCCH transmitted in a wider bandwidth than the firstNR-PUCCH and transmitted in a shorter time than the first NR-PUCCH willbe described as another example of the configuration of the NR-PUCCH.Note that, in the following description, this NR-PUCCH is also referredto as a “second NR-PUCCH.” As a specific example, the second NR-PUCCHcan be transmitted using two symbols and seven resource blocks.Therefore, in a case in which the second NR-PUCCH is used, thetransmission can end in a shorter time than the first NR-PUCCH.Moreover, the second NR-PUCCH is preferably used to carry ACK/NACK tothe NR-PDSCH in the self-contained transmission.

<Details of First NR-PUCCH in Present Embodiment>

Next, the first NR-PUCCH will be described in detail below. FIG. 15 isan explanatory diagram illustrating an example of a configuration of thefirst NR-PUCCH. The first NR-PUCCH is transmitted using, for example,one resource block in one sub frame. Moreover, in order to obtainfrequency diversity, a half (for example, seven symbols and one slot) ofthe first NR-PUCCH on the time axis can also be allocated to anotherresource block. Note that the first NR-PUCCH may be consecutivelyallocated to the same frequency resources in one sub frame. For example,in the example illustrated in FIG. 15, first NR-PUCCH resources areensured to be point-symmetric centering on an uplink predeterminedbandwidth (for example, an uplink bandwidth in which a terminal deviceis supported or an uplink system bandwidth of a base station device). Inthis way, the first NR-PUCCH may be allocated so that at least a part isdifferent from another part in a position in the time direction and thefrequency direction (that is, both a symbol and a resource block aredifferent from each other) in one sub frame. In other words, the firstNR-PUCCH may be allocated so that at least a part allocated for apartial period in one sub frame is allocated to a different resourceblock from another part allocated for another period.

Note that, in the base station device, resource blocks or resourceelements not used as the first NR-PUCCH (resources other than hatchedportions in FIG. 15) may be used to perform at least one process amonganother uplink transmission, another sidelink transmission, anothersidelink reception, and another downlink reception of the base stationdevice.

Moreover, in the terminal device, resource blocks or resource elementsnot used as the first NR-PUCCH (resources other than hatched portions inFIG. 15) may be used to perform at least one among another uplinktransmission, another sidelink transmission, another sidelink reception,and another downlink reception of the terminal device.

Moreover. FIG. 16 is an explanatory diagram illustrating another exampleof the configuration of the first NR-PUCCH. A difference from theexample illustrated in FIG. 15 is that the first NR-PUCCH illustrated inFIG. 16 is transmitted using one pair of resource blocks. In thisconfiguration, it is difficult to obtain the frequency diversitycompared to the example illustrated in FIG. 15. However, since the samefrequency bandwidth is used for a longer time, it is more satisfactoryin channel estimation correction of the time direction. That is, in theexample illustrated in FIG. 16, for example, in a case in which anuplink predetermined bandwidth is a narrow bandwidth or the like,satisfactory characteristics can be obtained in an environment in whichthe frequency diversity is not sufficiently obtained.

<Details of Second NR-PUCCH in Present Embodiment>

Next, the second NR-PUCCH will be described in detail below. FIG. 17 isan explanatory diagram illustrating an example of a configuration of thesecond NR-PUCCH. In the example illustrated in FIG. 17, the secondNR-PUCCH is transmitted using, for example, four symbols and threeresource blocks from the rear of the sub frame. Moreover, in order toobtain the frequency diversity, a half (for example, two symbols) of thesecond NR-PUCCH on the time axis can also be allocated to anotherresource block as in the first NR-PUCCH. For example, in the exampleillustrated in FIG. 17, second NR-PUCCH resources are ensured to bepoint-symmetric centering on an uplink predetermined bandwidth (forexample, an uplink bandwidth in which a terminal device is supported oran uplink system bandwidth of the base station device). In this way, thesecond NR-PUCCH may be allocated so that at least a part is differentfrom another part in a position in the time direction and the frequencydirection (that is, both a symbol and a resource block are differentfrom each other) in one sub frame. In other words, the second NR-PUCCHmay be allocated so that at least a part allocated to a part of theresource block is allocated for a different period in one sub frame fromanother part allocated to another resource block.

Note that, in the terminal device, resource blocks or resource elementsnot used as the second NR-PUCCH (resources other than hatched portionsin FIG. 17) may be used to perform at least one among another uplinktransmission, another sidelink transmission, another sidelink reception,and another downlink reception of the terminal device.

Note that, in the base station device, resource blocks or resourceelements not used as the second NR-PUCCH (resources other than hatchedportions in FIG. 17) may be used to perform at least one process amonganother uplink transmission, another sidelink transmission, anothersidelink reception, and another downlink reception of the base stationdevice.

Moreover, FIG. 18 is an explanatory diagram illustrating another exampleof the configuration of the second NR-PUCCH. The example illustrated inFIG. 17 is different from the example illustrated in FIG. 18 in that thesecond NR-PUCCH is transmitted with a wider bandwidth using sevenresource blocks and two symbols. Therefore, in the example illustratedin FIG. 18, a time necessary to transmit and receive the second NR-PUCCHis shorter, and thus it is possible to realize lower-latencycommunication.

<Logical-Physical Mapping of NR-PUCCH Resources in Present Embodiment>

Next, logical-physical mapping of NR-PUCCH resources will be describedbelow.

First, an example of logical-physical mapping of the first NR-PUCCHresources will be described. For example, FIG. 19 is an explanatorydiagram illustrating an example of logical-physical mapping of the firstNR-PUCCH resources. In FIG. 19, a number affixed to each physicalresource indicates a logical number (index) of the NR-PUCCH resource. Ina case in which the index of the PUCCH resource is instructed, the indexis mapped to a physical resource illustrated in FIG. 19. Moreover, inthe example illustrated in FIG. 19, indexes are first allocated insequence from the beginning in the time direction and indexes are laterallocated in sequence from a low frequency. In other words, in theexample illustrated in FIG. 19, the indexes are preferentially allocatedin sequence in the time direction from an end side of the frequencybandwidth in the frequency direction. Moreover, as in the exampleillustrated in FIG. 15, the indexes are allocated to be point-symmetriccentering on an uplink predetermined bandwidth.

Next, an example of logical-physical mapping of the second NR-PUCCHresources will be described. For example, FIG. 20 is an explanatorydiagram illustrating an example of logical-physical mapping of thesecond NR-PUCCH resources. Specifically, FIG. 20 illustrates an exampleof the logical-physical mapping in a case in which the configuration ofthe second NR-PUCCH described with reference to FIG. 17 is assumed. InFIG. 20, a number affixed to each physical resource indicates a logicalnumber (index) of the NR-PUCCH resource. In a case in which the index ofthe PUCCH resource is instructed, the index is mapped to a physicalresource illustrated in FIG. 20. The example illustrated in FIG. 20 isdifferent from the example illustrated in FIG. 19 in that indexes arefirst allocated in sequence in the frequency direction and indexes arelater allocated in sequence from the rear in the time direction. Inother words, in the example illustrated in FIG. 20, the indexes arepreferentially allocated in sequence in the frequency direction from therear side in the time direction during a predetermined period of a subframe or the like. Thus, it is easy to allocate the second NR-PUCCH tothe rear side of the sub frame (that is, the rear end side in the timedirection). That is, in the example illustrated in FIG. 20, it ispossible to ensure a wider region on the front side in the timedirection than the region to which the second NR-PUCCH is allocated. Forexample, it is possible to allocate downlink resources to the region onthe front side more flexibly. Therefore, by realizing the configurationillustrated in FIG. 20, for example, it is possible to realize theself-contained transmission with good resource efficiency.

Moreover, FIG. 21 is an explanatory diagram illustrating another exampleof the logical-physical mapping of the second NR-PUCCH resources.Specifically, FIG. 21 illustrates another example of thelogical-physical mapping in a case in which the configuration of thesecond NR-PUCCH described with reference to FIG. 18 is assumed. In theexample illustrated in FIG. 21, it is easier to aggregate the secondNR-PUCCH on the rear side of the sub frame than in the exampleillustrated in FIG. 20. Therefore, by realizing the configurationillustrated in FIG. 21, for example, it is possible to realize theself-contained transmission with better resource efficiency.

Note that, although the NR-PUCCH resources in the time and frequencydomains have been described in each of the above-described examples, theindexes of the NR-PUCCH resources may also be allocated on a code axiswhen code multiplexing is possible.

<Allocation of NR-PUCCH Resources in Present Embodiment>

Next, an allocation scheme for the NR-PUCCH resources will be describedbelow.

As an example of the allocation technique for the NR-PUCCH resources,the NR-PUCCH resources may be decided in accordance with a terminaldevice on the basis of an NR-PDCCH to which the NR-PDCCH correspondingto an ACK/NACK response included in the NR-PUCCH is scheduled.

Moreover, as another example of the allocation technique for theNR-PUCCH resources based on the NR-PDCCH, a terminal device may benotified of indexes of the NR-PUCCH resources by a predetermined fieldwith an NR-DCI format included in the NR-PDCCH.

Moreover, as still another example of the allocation technique for theNR-PUCCH resources based on the NR-PDCCH, the terminal device may benotified of association information with the indexes of the NR-PUCCHresources or the resource block of the NR-PUCCH by a predetermined fieldwith the NR-DCI format included in the NR-PDCCH. A relation between theindexes of the NR-PUCCH resources or the resource block of the NR-PUCCHand bit information of the predetermined field may be set with, forexample, an RRC message.

Moreover, as still another example of the allocation technique for theNR-PUCCH resources based on the NR-PDCCH, the terminal device may benotified of the resource block transmitted by the NR-PUCCH with apredetermined field of the NR-DCI format included in the NR-PDCCH. Theinformation with which the resource block is notified of may have thesame instruction format as, for example, the resource block used toschedule the NR-PDSCH.

Moreover, as still another example of the allocation technique for theNR-PUCCH resources based on the NR-PDCCH, the NR-PUCCH resources may bedecided in association with an NR-CCE to which the NR-PDCCH is mapped.As a specific example, indexes of the head of the NR-CCE included in theNR-PDCCH are associated with the indexes of the NR-PUCCH resources. Morespecifically, the indexes of the NR-PUCCH resources are decided on thebasis of an NR-CCE index and a predetermined offset. The predeterminedoffset is decided in accordance with dedicated RRC information orinformation of NR-DCI included in the NR-PDCCH.

Moreover, as still another example of the allocation scheme for theNR-PUCCH resources, the NR-PUCCH resources may be decided in associationwith the resource block in which the NR-PDSCH corresponding to ACK/NACKcarrying the NR-PUCCH is used. As a specific example, a minimum resourceblock index in the resource block in which the NR-PDSCH is used isassociated with the index of the NR-PUCCH resources. More specifically,the indexes of the NR-PUCCH resources may be decided on the basis of theminimum resource block index and a predetermined offset. Moreover, thepredetermined offset may be decided in accordance with dedicated RRCinformation or information of NR-DCI included in the NR-PDCCH.

<Multiplexing of NR-PUCCH in Present Embodiment>

The first NR-PUCCH and the second NR-PUCCH may be multiplexed in thesame NR carrier (NR cell). Thus, it is possible to accommodatecommunication of different request conditions in one carrier and it ispossible to operate the system with better efficiency.

For example, the first NR-PUCCH and the second NR-PUCCH may bemultiplexed on the time axis. As a specific example, the first NR-PUCCHand the second NR-PUCCH may be multiplexed in different sub frames. Forexample, FIG. 22 is an explanatory diagram illustrating an example oftime domain multiplexing of the first NR-PUCCH and the second NR-PDCCH.In the example illustrated in FIG. 22, the second NR-PUCCH istransmitted in an earlier NR uplink sub frame and the first NR-PUCCH istransmitted in a later NR uplink sub frame.

Moreover, the first NR-PUCCH and the second NR-PUCCH may be multiplexedon the frequency axis. As a specific example, the first NR-PUCCH and thesecond NR-PUCCH may be multiplexed in different resource blocks. Forexample, FIG. 23 is an explanatory diagram illustrating an example offrequency domain multiplexing of the first NR-PUCCH and the secondNR-PDCCH. In the example illustrated in FIG. 23, the first NR-PUCCH istransmitted at an end portion of an uplink predetermined bandwidth andthe second NR-PUCCH is transmitted at a central portion of the uplinkpredetermined bandwidth.

Note that the first NR-PUCCH and the second NR-PUCCH may be multiplexedon a spatial axis. Moreover, the first NR-PUCCH and the second NR-PUCCHmay be multiplexed on a code axis.

<Switching of NR-PUCCH in Present Embodiment>

Next, the details of switching between two types of NR-PUCCHs (that is,switching between the first NR-PUCCH and the second NR-PUCCH) in thepresent embodiment will be described below.

The terminal device can switch transmission of the first NR-PUCCH andthe second NR-PUCCH in accordance with a predetermined condition. Forexample, a configuration of the NR-PUCCH to be transmitted (in otherwords, the configuration of the NR-PUCCH requested to realize a usecase) is different between a case in which low consumption power isrequested and a case in which low latency is requested. Thus, it ispossible to realize flexible communication in accordance with differentrequest conditions.

As an example of switching means of the NR-PUCCH, the terminal devicemay switch between types of NR-PUCCHs to be transmitted (that is, mayswitch between the first NR-PUCCH and the second NR-PUCCH) on the basisof the NR-PDCCHs.

As an example of a switching condition based on the NR-PDCCH, theterminal device may switch the types of NR-PUCCHs on the basis of atiming at which transmission of the NR-PUCCH is instructed. For example,as in the example illustrated in FIG. 22, the terminal device maytransmit the second NR-PUCCH in a case in which the transmission of theNR-PUCCH with an early NR uplink sub frame is instructed and maytransmit the first NR-PUCCH in a case in which transmission of theNR-PUCCH in a later NR uplink sub frame is instructed.

Note that information for instructing a transmission timing of theNR-PUCCH may be, for example, information for instructing theself-contained transmission. As a specific example, in a case in whichthe self-contained transmission is not instructed, the terminal devicemay perform transmission with a predetermined sub frame (for example, asub frame later by four sub frames from the sub frame received with theNR-PDCCH) using the first NR-PUCCH. Conversely, in a case in which theself-contained transmission is instructed, the terminal device mayperform transmission with the same sub frame as the channel instructedwith the NR-PDCCH using the second NR-PUCCH.

Moreover, the information for instructing the transmission timing of theNR-PUCCH may be, for example, offset information for instructing an NRuplink sub frame with which the NR-PUCCH is transmitted. As a specificexample, the offset information may be offset information from an endtiming of the received NR-PDCCH or an end timing of a channel scheduledby the NR-PDCCH. Moreover, as another example, the offset informationmay be offset information from a start timing of the received NR-PDCCHor a start timing of the channel scheduled by the NR-PDCCH. Moreover, ina case in which the offset information is equal to or less than apredetermined value, the terminal device may transmit the firstNR-PUCCH. Conversely, in a case in which the offset information is equalto or greater than a predetermined value, the terminal device maytransmit the second NR-PUCCH. Note that the timing and the offsetinformation is preferably, for example, one of an NR sub frame, a slot,and a symbol.

Moreover, the information for instructing the transmission timing of theNR-PUCCH may be, for example, information regarding a timing number forinstructing the NR uplink sub frame with which the NR-PUCCH istransmitted. The timing number is preferably one of a system framenumber (SFN), a sub frame number, a slot number, and a symbol number.Here, in a case in which the transmission is difficult at a timinginstructed by the information as the timing in accordance with aprocessing capability of the terminal device as in a case or the like inwhich preparation for transmitting the NR-PUCCH is late, the NR-PUCCHmay be transmitted at a subsequent timing. Moreover, in a case in whichthe transmission can be performed at a timing instructed by the notifiedinformation, the terminal device may transmit the second NR-PUCCH at thetiming. Conversely, in a case in which it is difficult to perform thetransmission at the timing instructed by the notified information, theterminal device may transmit the first NR-PUCCH at a subsequent timing.

Moreover, the information for instructing the transmission timing of theNR-PUCCH may be, for example, information regarding a channel length ofthe NR-PDSCH or the NR-PUSCH scheduled by the NR-DCI included in theNR-PUCCH. Specifically, the information regarding the channel length ofthe NR-PDSCH or the NR-PUSCH may be information indicating end of thechannel of the NR-PDSCH or the NR-PUSCH. Note that the terminal devicemay transmit the first NR-PUCCH in a case in which the notifiedinformation indicates end later than a predetermined end timing.Conversely, the terminal device may transmit the second NR-PUCCH in acase in which the notified information indicates end earlier than apredetermined end timing. The first NR-PUCCH transmitted in a case inwhich the notified information indicates end later than thepredetermined end timing is preferably transmitted with a sub framelater than the sub frame transmitted with the NR-PDSCH or the NR-PUSCH.Moreover, the second NR-PUCCH transmitted in a case in which thenotified information indicates end earlier than the predetermined endtiming is preferably transmitted with the same sub frame as the subframe transmitted with the NR-PDSCH or the NR-PUSCH. Note thatinformation regarding the predetermined end timing is preferablyinformation regarding a symbol unit and may be information regarding aslot unit.

Moreover, as an example of the switching condition on the basis of theNR-PDCCH, the terminal device may perform the switching on the basis ofinformation for instructing the switching of the type of NR-PUCCH.Specifically, the information for instructing to switch the type ofNR-PUCCH may be information in accordance with a bit format indicatingtransmission of the first NR-PUCCH or the second NR-PUCCH. Note that ina case in which the bit indicates 1, the terminal device may transmitthe first NR-PUCCH. In a case in which the bit indicates 0, the terminaldevice may transmit the second NR-PUCCH.

Moreover, as an example of switching means of the NR-PUCCH, the terminaldevice may switch the type of NR-PUCCH to be transmitted on the basis ofan RRC message.

The RRC message may include, for example, a setting parameter forinstructing the self-contained transmission. In this case, in a case inwhich the self-contained transmission is not instructed in accordancewith the parameter, the terminal device may transmit a predetermined subframe (for example, a sub frame later by four sub frames from the subframe with which the NR-PDCCH is received) using the first NR-PUCCH.Conversely, in a case in which the self-contained transmission isinstructed in accordance with the parameter, the terminal device maytransmit the same sub frame as the channel instructed with the NR-PDCCHusing the second NR-PUCCH.

Moreover, the RRC message may include, for example, a setting parameterregarding the NR-PUCCH. In this case, in a case in which the firstNR-PUCCH is set in accordance with the setting parameter, the terminaldevice may transmit the first NR-PUCCH. Moreover, in a case in which thesecond NR-PUCCH is set in accordance with the setting parameter, theterminal device may transmit the second NR-PUCCH. Note that in the casein which the setting of both the first NR-PUCCH and the second NR-PUCCHis performed in accordance the setting parameter, the second NR-PUCCH ispreferably transmitted.

Note that in a case in which the terminal device is in a state in whichRRC connection is not established (an RRC idle state), the terminaldevice may transmit the first NR-PUCCH.

The RRC message for instructing the switching in the base station devicemay be transmitted to the terminal device on the basis of the capabilityof the terminal device. Therefore, the terminal device may transmitinformation indicating the capability to the base station device.Examples of the information regarding the capability include a parameterindicating a terminal category suggesting that a processing capabilityof a high function is mounted, a parameter indicating whether to realizethe self-contained transmission, a parameter indicating whether totransmit the second NR-PUCCH, and a parameter indicating a generationprocessing time of the NR-PUCCH.

Moreover, as another example of the switching means of the NR-PUCCH, thetype of NR-PUCCH may be switched in a case in which a predeterminedcondition is satisfied in the terminal device.

As an example of the predetermined condition, a condition indicatingwhether or not a type of information (UCI) carried with the NR-PUCCH isa predetermined type can be exemplified. As a specific example, when theinformation carried with the NR-PUCCH is CSI, the terminal device maytransmit the information using the first NR-PUCCH. On the other hand,when the information carried with the NR-PUCCH is only ACK/NACK of theNR-PDSCH, the terminal device may transmit the information using thesecond NR-PUCCH. In other words, when the information carried with theNR-PUCCH includes CSI, the terminal device transmits the informationusing the first NR-PUCCH. When the information does not include CSI, theterminal device may transmit the information using the second NR-PUCCH.

Note that the base station device may acquire new information dependingon whether one of the first NR-PUCCH and the second NR-PUCCH isreceived. For example, in a case in which the first NR-PUCCH isreceived, the base station device may recognize that the correspondingterminal device transmits a scheduling request (SR). Conversely, in acase in which the second NR-PUCCH is received, the base station devicemay recognize that the corresponding terminal device does not transmitthe scheduling request (SR). Moreover, in a case in which uplink datadesired to be transmitted is generated, the terminal device may transmitthe first NR-PUCCH. In other cases, the terminal device may transmit thesecond NR-PUCCH.

Moreover, as another example of the predetermined condition, a conditionindicating whether the number of bits of ACK/NACK transmitted with oneNR-PUCCH is equal to or greater than a predetermined value can beexemplified. As a specific example, in a case in which the number ofbits of the ACK/NACK is equal to or greater than the predeterminedvalue, the terminal device may transmit the first NR-PUCCH. Conversely,in a case in which the number of bits of the ACK/NACK is equal to orless than the predetermined value, the terminal device may transmit thesecond NR-PUCCH. Note that instead of the number of bits of ACK/NACK,the number of sub frames with which the NR-PDSCH corresponding to theACK/NACK is transmitted or the number of serving cells set in accordancewith carrier aggregation may be applied as the predetermined condition.

Moreover, as still another example of the predetermined condition, acondition indicating whether a bandwidth (band) with which the NR-PUCCHis transmitted is a predetermined bandwidth can be exemplified. As aspecific example, in a case in which the bandwidth (band) with which theNR-PUCCH is transmitted is not an unlicensed band such as 5 GHz, theterminal device may transmit the first NR-PUCCH. Conversely, in a casein which the bandwidth (band) with which the NR-PUCCH is transmitted isthe unlicensed band, the terminal device may transmit the secondNR-PUCCH.

Moreover, as still another example of the predetermined condition, acondition indicating whether the NR-PUCCH to be transmitted is apredetermined physical parameter can be exemplified. As a specificexample, in a case in which an instruction to transmit the NR-PUCCH isgiven with the predetermined physical parameter, the terminal device maytransmit the first NR-PUCCH. Conversely, in a case in which theinstruction to transmit the NR-PUCCH is given with a physical parameterdifferent from the predetermined physical parameter, the terminal devicemay transmit the second NR-PUCCH.

Moreover, as still another example of the predetermined condition, acondition based on a result obtained by comparing transmission power ofthe NR-PUCCH to a predetermined value can be exemplified. As a specificexample, in a case in which transmission power of the second NR-PUCCH iscalculated and a calculation result of the transmission power is equalto or greater than a predetermined value, the terminal device maytransmit the first NR-PUCCH. Conversely, in a case in which thecalculation result of the transmission power is less than apredetermined value, the terminal device may transmit the secondNR-PUCCH.

Moreover, as still another example of the predetermined condition, acondition indicating whether a bandwidth (band) with which the NR-PDSCHcorresponding to an ACK/NACK response carried with the NR-PUCCH istransmitted is a predetermined bandwidth can be exemplified.

Moreover, as still another example of the predetermined condition, acondition indicating whether an instruction to transmit the NR-PUCCH inaccordance with the waveform of a predetermined carrier wave is givencan be exemplified. As a specific example, in a case in which uplinktransmission is transmission with SC-FDMA such as DFT-S-OFDM, theterminal device may perform the transmission using the first NR-PUCCH.Conversely, in a case in which the uplink transmission is transmissionwith OFDM, the terminal device may perform the transmission using thesecond NR-PUCCH.

Moreover, as still another example of the predetermined condition, acondition indicating whether a type of RAT set in accordance with dualconnectivity is predetermined RAT can be exemplified. As a specificexample, in a case in which dual connectivity with LTE is set, theterminal device may transmit the first NR-PUCCH. Conversely, in a casein which dual connectivity with only NR is set, the terminal device maytransmit the second NR-PUCCH.

Note that the above-described switching of the NR-PUCCH has beendescribed focusing on the switching between the first NR-PUCCH and thesecond NR-PUCCH, but the foregoing condition can be applied as inswitching of a parameter in the first NR-PUCCH or switching of aparameter in the second NR-PUCCH. Here, as the switching of theparameter in the first NR-PUCCH, for example, switching or the like ofthe number of resource blocks used in the first NR-PUCCH can beexemplified. Moreover, as the switching of the parameter in the secondNR-PUCCH, for example, switching or the like of the number of symbolsused in the second NR-PUCCH can be exemplified.

Moreover, by substituting the foregoing NR-PUCCHs with sidelink ACK/NACKchannels carrying ACK/NACK responses corresponding to NR-PSSCHs in asidelink, it is possible to expect advantageous effects similar to thoseof uplink communication in sidelink communication.

Note that the configurations and the mapping method of theabove-described first NR-PUCCH and second NR-PUCCH are not limited toNR, but similar configurations and means can be applied even in LTE orother RAT.

Moreover, the switching of the above-described NR-PUCCH and the NR-PUCCHis not limited only to NR, but similar means can be applied even in LTEor other RAT.

2. APPLICATION EXAMPLES

The technology according to the present disclosure can be applied tovarious products. For example, the base station device 1 may be realizedas any type of evolved Node B (eNB) such as a macro eNB or a small eNB.The small eNB may be an eNB that covers a cell, such as a pico eNB, amicro eNB, or a home (femto) eNB, smaller than a macro cell. Instead,the base station device 1 may be realized as another type of basestation such as a NodeB or a base transceiver station (BTS). The basestation device 1 may include a main entity (also referred to as a basestation device) that controls wireless communication and one or moreremote radio heads (RRHs) disposed at different locations from the mainentity. Further, various types of terminals to be described below mayoperate as the base station device 1 by performing a base stationfunction temporarily or permanently. Moreover, at least some of theconstituent elements of the base station device 1 may be realized in abase station device or a module for the base station device.

Further, for example, the terminal device 2 may be realized as a mobileterminal such as a smartphone, a tablet personal computer (PC), anotebook PC, a portable game terminal, a portable/dongle mobile routeror a digital camera, or an in-vehicle terminal such as a car navigationdevice. Further, the terminal device 2 may be realized as a terminalthat performs machine to machine (M2M) communication (also referred toas a machine type communication (MTC) terminal). Moreover, at least someof the constituent elements of the terminal device 2 may be realized ina module mounted on the terminal (for example, an integrated circuitmodule configured on one die).

<2.1. Application Examples for Base Station> First Application Example

FIG. 24 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 800 includes one or more antennas 810and a base station apparatus 820. Each antenna 810 and the base stationapparatus 820 may be connected to each other via an RF cable.

Each of the antennas 810 includes a single or a plurality of antennaelements (e.g., a plurality of antenna elements constituting a MIMOantenna) and is used for the base station apparatus 820 to transmit andreceive a wireless signal. The eNB 80X) may include the plurality of theantennas 810 as illustrated in FIG. 24, and the plurality of antennas810 may, for example, correspond to a plurality of frequency bands usedby the eNB 800. It should be noted that while FIG. 24 illustrates anexample in which the eNB 800 includes the plurality of antennas 810, theeNB 800 may include the single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822,a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operatesvarious functions of an upper layer of the base station apparatus 820.For example, the controller 821 generates a data packet from data in asignal processed by the wireless communication interface 825, andtransfers the generated packet via the network interface 823. Thecontroller 821 may generate a bundled packet by bundling data from aplurality of base band processors to transfer the generated bundledpacket. Further, the controller 821 may also have a logical function ofperforming control such as radio resource control, radio bearer control,mobility management, admission control, and scheduling. Further, thecontrol may be performed in cooperation with a surrounding eNB or a corenetwork node. The memory 822 includes a RAM and a ROM, and stores aprogram executed by the controller 821 and a variety of control data(such as, for example, terminal list, transmission power data, andscheduling data).

The network interface 823 is a communication interface for connectingthe base station apparatus 820 to the core network 824. The controller821 may communicate with a core network node or another eNB via thenetwork interface 823. In this case, the eNB 800 may be connected to acore network node or another eNB through a logical interface (e.g., S1interface or X2 interface). The network interface 823 may be a wiredcommunication interface or a wireless communication interface forwireless backhaul. In the case where the network interface 823 is awireless communication interface, the network interface 823 may use ahigher frequency band for wireless communication than a frequency bandused by the wireless communication interface 825.

The wireless communication interface 825 supports a cellularcommunication system such as long term evolution (LTE) or LTE-Advanced,and provides wireless connection to a terminal located within the cellof the eNB 800 via the antenna 810. The wireless communication interface825 may typically include a base band (BB) processor 826, an RF circuit827, and the like. The BB processor 826 may, for example, performencoding/decoding, modulation/demodulation, multiplexing/demultiplexing,and the like, and performs a variety of signal processing on each layer(e.g., L1, medium access control (MAC), radio link control (RLC), andpacket data convergence protocol (PDCP)). The BB processor 826 may havepart or all of the logical functions as described above instead of thecontroller 821. The BB processor 826 may be a module including a memoryhaving a communication control program stored therein, a processor toexecute the program, and a related circuit, and the function of the BBprocessor 826 may be changeable by updating the program. Further, themodule may be a card or blade to be inserted into a slot of the basestation apparatus 820, or a chip mounted on the card or the blade.Meanwhile, the RF circuit 827 may include a mixer, a filter, anamplifier, and the like, and transmits and receives a wireless signalvia the antenna 810.

The wireless communication interface 825 may include a plurality of theBB processors 826 as illustrated in FIG. 24, and the plurality of BBprocessors 826 may, for example, correspond to a plurality of frequencybands used by the eNB 800. Further, the wireless communication interface825 may also include a plurality of the RF circuits 827, as illustratedin FIG. 24, and the plurality of RF circuits 827 may, for example,correspond to a plurality of antenna elements. Note that FIG. 24illustrates an example in which the wireless communication interface 825includes the plurality of BB processors 826 and the plurality of RFcircuits 827, but the wireless communication interface 825 may includethe single BB processor 826 or the single RF circuit 827.

In the eNB 800 illustrated in FIG. 24, one or more constituent elementsof the higher layer processing unit 101 and the control unit 103described with reference to FIG. 8 may be implemented in the wirelesscommunication interface 825. Alternatively, at least some of theconstituent elements may be implemented in the controller 821. As oneexample, a module including a part or the whole of (for example, the BBprocessor 826) of the wireless communication interface 825 and/or thecontroller 821 may be implemented on the eNB 800. The one or moreconstituent elements in the module may be implemented in the module. Inthis case, the module may store a program causing a processor tofunction as the one more constituent elements (in other words, a programcausing the processor to execute operations of the one or moreconstituent elements) and execute the program. As another example, aprogram causing the processor to function as the one or more constituentelements may be installed in the eNB 80X), and the wirelesscommunication interface 825 (for example, the BB processor 826) and/orthe controller 821 may execute the program. In this way, the eNB 800,the base station device 820, or the module may be provided as a deviceincluding the one or more constituent elements and a program causing theprocessor to function as the one or more constituent elements may beprovided. In addition, a readable recording medium on which the programis recorded may be provided.

Further, in the eNB 800 illustrated in FIG. 24, the receiving unit 105and the transmitting unit 107 described with reference to FIG. 8 may beimplemented in the wireless communication interface 825 (for example,the RF circuit 827). Further, the transceiving antenna 109 may beimplemented in the antenna 810. Further, the network communication unit130 may be implemented in the controller 821 and/or the networkinterface 823.

Second Application Example

FIG. 25 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 830 includes one or more antennas 840,a base station apparatus 850, and an RRH 860. Each of the antennas 840and the RRH 860 may be connected to each other via an RF cable. Further,the base station apparatus 850 and the RRH 860 may be connected to eachother by a high speed line such as optical fiber cables.

Each of the antennas 840 includes a single or a plurality of antennaelements (e.g., antenna elements constituting a MIMO antenna), and isused for the RRH 860 to transmit and receive a wireless signal. The eNB830 may include a plurality of the antennas 840 as illustrated in FIG.25, and the plurality of antennas 840 may, for example, correspond to aplurality of frequency bands used by the eNB 830. Note that FIG. 25illustrates an example in which the eNB 830 includes the plurality ofantennas 840, but the eNB 830 may include the single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852,a network interface 853, a wireless communication interface 855, and aconnection interface 857. The controller 851, the memory 852, and thenetwork interface 853 are similar to the controller 821, the memory 822,and the network interface 823 described with reference to FIG. 24.

The wireless communication interface 855 supports a cellularcommunication system such as LTE and LTE-Advanced, and provides wirelessconnection to a terminal located in a sector corresponding to the RRH860 via the RRH 860 and the antenna 840. The wireless communicationinterface 855 may typically include a BB processor 856 or the like. TheBB processor 856 is similar to the BB processor 826 described withreference to FIG. 24 except that the BB processor 856 is connected to anRF circuit 864 of the RRH 860 via the connection interface 857. Thewireless communication interface 855 may include a plurality of the BBprocessors 856, as illustrated in FIG. 24, and the plurality of BBprocessors 856 may, for example, correspond to a plurality of frequencybands used by the eNB 830. Note that FIG. 25 illustrates an example inwhich the wireless communication interface 855 includes the plurality ofBB processors 856, but the wireless communication interface 855 mayinclude the single BB processor 856.

The connection interface 857 is an interface for connecting the basestation apparatus 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module forcommunication on the high speed line which connects the base stationapparatus 850 (wireless communication interface 855) to the RRH 860.

Further, the RRH 860 includes a connection interface 861 and a wirelesscommunication interface 863.

The connection interface 861 is an interface for connecting the RRH 860(wireless communication interface 863) to the base station apparatus850. The connection interface 861 may be a communication module forcommunication on the high speed line.

The wireless communication interface 863 transmits and receives awireless signal via the antenna 840. The wireless communicationinterface 863 may typically include the RF circuit 864 or the like. TheRF circuit 864 may include a mixer, a filter, an amplifier and the like,and transmits and receives a wireless signal via the antenna 840. Thewireless communication interface 863 may include a plurality of the RFcircuits 864 as illustrated in FIG. 25, and the plurality of RF circuits864 may, for example, correspond to a plurality of antenna elements.Note that FIG. 25 illustrates an example in which the wirelesscommunication interface 863 includes the plurality of RF circuits 864,but the wireless communication interface 863 may include the single RFcircuit 864.

In the eNB 830 illustrated in FIG. 25, one or more constituent elementsof the higher layer processing unit 101 and the control unit 103described with reference to FIG. 8 may be implemented in the wirelesscommunication interface 855 and/or the wireless communication interface863. Alternatively, at least some of the constituent elements may beimplemented in the controller 851. As one example, a module including apart or the whole of (for example, the BB processor 856) of the wirelesscommunication interface 855 and/or the controller 851 may be implementedon the eNB 830. The one or more constituent elements may be implementedin the module. In this case, the module may store a program causing aprocessor to function as the one more constituent elements (in otherwords, a program causing the processor to execute operations of the oneor more constituent elements) and execute the program. As anotherexample, a program causing the processor to function as the one or moreconstituent elements may be installed in the eNB 830, and the wirelesscommunication interface 855 (for example, the BB processor 856) and/orthe controller 851 may execute the program. In this way, the eNB 830,the base station device 850, or the module may be provided as a deviceincluding the one or more constituent elements and a program causing theprocessor to function as the one or more constituent elements may beprovided. In addition, a readable recording medium on which the programis recorded may be provided.

Further, in the eNB 830 illustrated in FIG. 25, for example, thereceiving unit 105 and the transmitting unit 107 described withreference to FIG. 8 may be implemented in the wireless communicationinterface 863 (for example, the RF circuit 864). Further, thetransceiving antenna 109 may be implemented in the antenna 840. Further,the network communication unit 130 may be implemented in the controller851 and/or the network interface 853.

<2.2 Application Examples for Terminal Apparatus> First ApplicationExample

FIG. 26 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 900 to which the technology according tothe present disclosure may be applied. The smartphone 900 includes aprocessor 901, a memory 902, a storage 903, an external connectioninterface 904, a camera 906, a sensor 907, a microphone 908, an inputdevice 909, a display device 910, a speaker 911, a wirelesscommunication interface 912, one or more antenna switches 915, one ormore antennas 916, a bus 917, a battery 918, and an auxiliary controller919.

The processor 901 may be, for example, a CPU or a system on chip (SoC),and controls the functions of an application layer and other layers ofthe smartphone 900. The memory 902 includes a RAM and a ROM, and storesa program executed by the processor 901 and data. The storage 903 mayinclude a storage medium such as semiconductor memories and hard disks.The external connection interface 904 is an interface for connecting thesmartphone 900 to an externally attached device such as memory cards anduniversal serial bus (USB) devices.

The camera 906 includes, for example, an image sensor such as chargecoupled devices (CCDs) and complementary metal oxide semiconductor(CMOS), and generates a captured image. The sensor 907 may include asensor group including, for example, a positioning sensor, a gyrosensor, a geomagnetic sensor, an acceleration sensor and the like. Themicrophone 908 converts a sound that is input into the smartphone 900 toan audio signal. The input device 909 includes, for example, a touchsensor which detects that a screen of the display device 910 is touched,a key pad, a keyboard, a button, a switch or the like, and accepts anoperation or an information input from a user. The display device 910includes a screen such as liquid crystal displays (LCDs) and organiclight emitting diode (OLED) displays, and displays an output image ofthe smartphone 900. The speaker 911 converts the audio signal that isoutput from the smartphone 900 to a sound.

The wireless communication interface 912 supports a cellularcommunication system such as LTE or LTE-Advanced, and performs wirelesscommunication. The wireless communication interface 912 may typicallyinclude the BB processor 913, the RF circuit 914, and the like. The BBprocessor 913 may, for example, perform encoding/decoding,modulation/demodulation, multiplexing/demultiplexing, and the like, andperforms a variety of types of signal processing for wirelesscommunication. On the other hand, the RF circuit 914 may include amixer, a filter, an amplifier, and the like, and transmits and receivesa wireless signal via the antenna 916. The wireless communicationinterface 912 may be a one-chip module in which the BB processor 913 andthe RF circuit 914 are integrated. The wireless communication interface912 may include a plurality of BB processors 913 and a plurality of RFcircuits 914 as illustrated in FIG. 26. Note that FIG. 26 illustrates anexample in which the wireless communication interface 912 includes aplurality of BB processors 913 and a plurality of RF circuits 914, butthe wireless communication interface 912 may include a single BBprocessor 913 or a single RF circuit 914.

Further, the wireless communication interface 912 may support othertypes of wireless communication system such as a short range wirelesscommunication system, a near field communication system, and a wirelesslocal area network (LAN) system in addition to the cellularcommunication system, and in this case, the wireless communicationinterface 912 may include the BB processor 913 and the RF circuit 914for each wireless communication system.

Each antenna switch 915 switches a connection destination of the antenna916 among a plurality of circuits (for example, circuits for differentwireless communication systems) included in the wireless communicationinterface 912.

Each of the antennas 916 includes one or more antenna elements (forexample, a plurality of antenna elements constituting a MIMO antenna)and is used for transmission and reception of the wireless signal by thewireless communication interface 912. The smartphone 900 may include aplurality of antennas 916 as illustrated in FIG. 26. Note that FIG. 26illustrates an example in which the smartphone 900 includes a pluralityof antennas 916, but the smartphone 900 may include a single antenna916.

Further, the smartphone 900 may include the antenna 916 for eachwireless communication system. In this case, the antenna switch 915 maybe omitted from a configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903,the external connection interface 904, the camera 906, the sensor 907,the microphone 908, the input device 909, the display device 910, thespeaker 911, the wireless communication interface 912, and the auxiliarycontroller 919 to each other.

The battery 918 supplies electric power to each block of the smartphone900 illustrated in FIG. 26 via a feeder line that is partiallyillustrated in the figure as a dashed line. The auxiliary controller919, for example, operates a minimally necessary function of thesmartphone 900 in a sleep mode.

In the smartphone 900 illustrated in FIG. 26, one or more constituentelements of the higher layer processing unit 201 and the control unit203 described with reference to FIG. 9 described with reference to FIG.9 may be implemented in the wireless communication interface 912.Alternatively, at least some of the constituent elements may beimplemented in the processor 901 or the auxiliary controller 919. As oneexample, a module including a part or the whole of (for example, the BBprocessor 913) of the wireless communication interface 912, theprocessor 901, and/or the auxiliary controller 919 may be implemented onthe smartphone 900. The one or more constituent elements may beimplemented in the module. In this case, the module may store a programcausing a processor to function as the one more constituent elements (inother words, a program causing the processor to execute operations ofthe one or more constituent elements) and execute the program. Asanother example, a program causing the processor to function as the oneor more constituent elements may be installed in the smartphone 900, andthe wireless communication interface 912 (for example, the BB processor913), the processor 901, and/or the auxiliary controller 919 may executethe program. In this way, the smartphone 900 or the module may beprovided as a device including the one or more constituent elements anda program causing the processor to function as the one or moreconstituent elements may be provided. In addition, a readable recordingmedium on which the program is recorded may be provided.

Further, in the smartphone 900 illustrated in FIG. 26, for example, thereceiving unit 205 and the transmitting unit 207 described withreference to FIG. 9 may be implemented in the wireless communicationinterface 912 (for example, the RF circuit 914). Further, thetransceiving antenna 209 may be implemented in the antenna 916.

Second Application Example

FIG. 27 is a block diagram illustrating an example of a schematicconfiguration of a car navigation apparatus 920 to which the technologyaccording to the present disclosure may be applied. The car navigationapparatus 920 includes a processor 921, a memory 922, a globalpositioning system (GPS) module 924, a sensor 925, a data interface 926,a content player 927, a storage medium interface 928, an input device929, a display device 930, a speaker 931, a wireless communicationinterface 933, one or more antenna switches 936, one or more antennas937, and a battery 938.

The processor 921 may be, for example, a CPU or an SoC, and controls thenavigation function and the other functions of the car navigationapparatus 920. The memory 922 includes a RAM and a ROM, and stores aprogram executed by the processor 921 and data.

The GPS module 924 uses a GPS signal received from a GPS satellite tomeasure the position (e.g., latitude, longitude, and altitude) of thecar navigation apparatus 920. The sensor 925 may include a sensor groupincluding, for example, a gyro sensor, a geomagnetic sensor, abarometric sensor and the like. The data interface 926 is, for example,connected to an in-vehicle network 941 via a terminal that is notillustrated, and acquires data such as vehicle speed data generated onthe vehicle side.

The content player 927 reproduces content stored in a storage medium(e.g., CD or DVD) inserted into the storage medium interface 928. Theinput device 929 includes, for example, a touch sensor which detectsthat a screen of the display device 930 is touched, a button, a switchor the like, and accepts operation or information input from a user. Thedisplay device 930 includes a screen such as LCDs and OLED displays, anddisplays an image of the navigation function or the reproduced content.The speaker 931 outputs a sound of the navigation function or thereproduced content.

The wireless communication interface 933 supports a cellularcommunication system such as LTE or LTE-Advanced, and performs wirelesscommunication. The wireless communication interface 933 may typicallyinclude the BB processor 934, the RF circuit 935, and the like. The BBprocessor 934 may, for example, perform encoding/decoding,modulation/demodulation, multiplexing/demultiplexing, and the like, andperforms a variety of types of signal processing for wirelesscommunication. On the other hand, the RF circuit 935 may include amixer, a filter, an amplifier, and the like, and transmits and receivesa wireless signal via the antenna 937. The wireless communicationinterface 933 may be a one-chip module in which the BB processor 934 andthe RF circuit 935 are integrated. The wireless communication interface933 may include a plurality of BB processors 934 and a plurality of RFcircuits 935 as illustrated in FIG. 27. Note that FIG. 27 illustrates anexample in which the wireless communication interface 933 includes aplurality of BB processors 934 and a plurality of RF circuits 935, butthe wireless communication interface 933 may include a single BBprocessor 934 or a single RF circuit 935.

Further, the wireless communication interface 933 may support othertypes of wireless communication system such as a short range wirelesscommunication system, a near field communication system, and a wirelessLAN system in addition to the cellular communication system, and in thiscase, the wireless communication interface 933 may include the BBprocessor 934 and the RF circuit 935 for each wireless communicationsystem.

Each antenna switch 936 switches a connection destination of the antenna937 among a plurality of circuits (for example, circuits for differentwireless communication systems) included in the wireless communicationinterface 933.

Each of the antennas 937 includes one or more antenna elements (forexample, a plurality of antenna elements constituting a MIMO antenna)and is used for transmission and reception of the wireless signal by thewireless communication interface 933. The car navigation apparatus 920may include a plurality of antennas 937 as illustrated in FIG. 27. Notethat FIG. 27 illustrates an example in which the car navigationapparatus 920 includes a plurality of antennas 937, but the carnavigation apparatus 920 may include a single antenna 937.

Further, the car navigation apparatus 920 may include the antenna 937for each wireless communication system. In this case, the antenna switch936 may be omitted from a configuration of the car navigation apparatus920.

The battery 938 supplies electric power to each block of the carnavigation apparatus 920 illustrated in FIG. 27 via a feeder line thatis partially illustrated in the figure as a dashed line. Further, thebattery 938 accumulates the electric power supplied from the vehicle.

In the car navigation 920 illustrated in FIG. 27, one or moreconstituent elements of the higher layer processing unit 201 and thecontrol unit 203 described with reference to FIG. 9 described withreference to FIG. 9 may be implemented in the wireless communicationinterface 933. Alternatively, at least some of the constituent elementsmay be implemented in the processor 921. As one example, a moduleincluding a part or the whole of (for example, the BB processor 934) ofthe wireless communication interface 933 and/or the processor 921 may beimplemented on the car navigation 920. The one or more constituentelements may be implemented in the module. In this case, the module maystore a program causing a processor to function as the one moreconstituent elements (in other words, a program causing the processor toexecute operations of the one or more constituent elements) and executethe program. As another example, a program causing the processor tofunction as the one or more constituent elements may be installed in thecar navigation 920, and the wireless communication interface 933 (forexample, the BB processor 934) and/or the processor 921 may execute theprogram. In this way, the car navigation 920 or the module may beprovided as a device including the one or more constituent elements anda program causing the processor to function as the one or moreconstituent elements may be provided. In addition, a readable recordingmedium on which the program is recorded may be provided.

Further, in the car navigation 920 illustrated in FIG. 27, for example,the receiving unit 205 and the transmitting unit 207 described withreference to FIG. 9 may be implemented in the wireless communicationinterface 933 (for example, the RF circuit 935). Further, thetransceiving antenna 209 may be implemented in the antenna 937.

The technology of the present disclosure may also be realized as anin-vehicle system (or a vehicle) 940 including one or more blocks of thecar navigation apparatus 920, the in-vehicle network 941, and a vehiclemodule 942. That is, the in-vehicle system (or a vehicle) 940 may beprovided as a device that includes at least one of the higher layerprocessing unit 201, the control unit 203, the receiving unit 205, orthe transmitting unit 207. The vehicle module 942 generates vehicle datasuch as vehicle speed, engine speed, and trouble information, andoutputs the generated data to the in-vehicle network 941.

3. CONCLUSION

As described above, in the system according to the present embodiment, acommunication device (terminal device) selectively switches between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period (for example, one sub frame) in a time direction totransmit control information to a base station.

In this configuration, for example, a configuration of a plurality ofuplink control channels designed in accordance with a use case can bemultiplexed in a preferred suitable mode. Moreover, transmissionefficiency of the entire stem can be further improved.

Further, the communication device according to the present embodimentmay multiplex the first physical channel and the second physical channelin the time direction and the frequency direction. In thisconfiguration, in the system according to the present embodiment,communication of different request conditions can be accommodated in onecarrier. Therefore, the transmission efficiency of the entire system canbe further improved.

The preferred embodiment(s) of the present disclosure has/have beendescribed above with reference to the accompanying drawings, whilst thepresent disclosure is not limited to the above examples. A personskilled in the art may find various alterations and modifications withinthe scope of the appended claims, and it should be understood that theywill naturally come under the technical scope of the present disclosure.

Further, the effects described in this specification are merelyillustrative or exemplified effects, and are not limitative. That is,with or in the place of the above effects, the technology according tothe present disclosure may achieve other effects that are clear to thoseskilled in the art from the description of this specification.

Additionally, the present technology may also be configured as below.

(1)

A communication device including:

a communication unit configured to perform wireless communication; and

a control unit configured to selectively switch between a first physicalchannel and a second physical channel in which both conditions of thenumber of symbols and the number of resource blocks are different fromeach other and which are allocated during a predetermined period in atime series to transmit control information to a base station.

(2)

The communication device according to (1), in which the control unitswitches between the first physical channel and the second physicalchannel on the basis of a timing instructed from the base station.

(3)

The communication device according to (2), in which, in a case in whicha timing of self-contained transmission is instructed from the basestation, the control unit switches to the physical channel in which thenumber of symbols is less among the first physical channel and thesecond physical channel on the basis of the timing.

(4)

The communication device according to (2) or (3), including:

a notification unit configured to notify the base station of informationregarding a capability,

in which, after the notification of the information regarding thecapability, the control unit receives an instruction related to thetiming at which the first physical channel and the second physicalchannel are switched, from the base station.

(5)

The communication device according to any one of (1) to (4), in whichthe control unit switches between the first physical channel and thesecond physical channel in accordance with a type of data to betransmitted to the base station.

(6)

The communication device according to any one of (1) to (5), in whichthe control unit switches the first physical channel and the secondphysical channel in accordance with a frequency bandwidth fortransmitting the control information.

(7)

The communication device according to any one of (1) to (6), in whichthe control unit switches the first physical channel and the secondphysical channel in accordance with a calculation value of transmissionpower for transmitting the control information.

(8)

The communication device according to any one of (1) to (7), in whichthe control unit switches the first physical channel and the secondphysical channel in accordance with a communication system applied tocommunication with the base station.

(9)

The communication device according to any one of (1) to (8), in whichthe control unit switches the first physical channel and the secondphysical channel in accordance with a type of wireless access technologyset by dual connectivity.

(10)

The communication device according to any one of (1) to (9), in whichthe control unit multiplexes the first physical channel and the secondphysical channel in a time direction or a frequency direction during aperiod including the one or more predetermined periods.

(11)

The communication device according to (10), in which the control unitmultiplexes the first physical channel and the second physical channelin the time direction by allocating the first physical channel during asecond period located behind a first period in which the second physicalchannel is allocated, in the time direction among the two or morecontinuous predetermined periods.

(12)

The communication device according to (10), in which the control unitmultiplexes the first physical channel and the second physical channelin the frequency direction by allocating the first physical channel to aside closer to an end in the frequency direction and allocating thesecond physical channel to a side closer to a center in the frequencydirection, in a frequency bandwidth to which the first physical channeland the second physical channel are allocated.

(13)

A communication device including:

a communication unit configured to perform wireless communication; and

a notification unit configured to notify a terminal device ofinformation regarding switching between a first physical channel and asecond physical channel in which both conditions of the number ofsymbols and the number of resource blocks are different from each otherand which are allocated during a predetermined period in a time seriesto receive control information from the terminal device.

(14)

The communication device according to (13), including:

a control unit configured to control the allocation of the firstphysical channel and the second physical channel during thepredetermined period.

in which, in the second physical channel, the number of resource blocksis greater and the number of symbols is less than in the first physicalchannel.

(15)

The communication device according to (14), in which the control unitallocates the second physical channel to a side closer to a rear in atime direction during the predetermined period.

(16)

The communication device according to (15), in which the control unitpreferentially allocates an index for mapping the control information tothe second physical channel, from the rear side in the time directionduring the predetermined period.

(17)

The communication device according to (15) or (16), in which the controlunit allocates at least a part of the second physical channel such thatthe part becomes different from another part in respective positions inthe time direction and a frequency direction during the predeterminedperiod.

(18)

The communication device according to any one of (14) to (17), in whichthe control unit allocates the first physical channel to a side closerto an end in a frequency direction of the frequency bandwidth which isan allocation target of the first physical channel.

(19)

The communication device according to (18), in which the control unitpreferentially allocates an index for mapping the control information tothe first physical channel from the end side in the frequency directionof the frequency bandwidth.

(20)

The communication device according to (18) or (19), in which the controlunit allocates at least a part of the first physical channel such thatthe part becomes different from another part in respective positions ina time direction and the frequency direction during the predeterminedperiod.

(21)

The communication device according to (18) or (19), in which the controlunit consecutively allocates the first physical channel to one end sidein the frequency direction of the frequency bandwidth during thepredetermined period.

(22)

A communication method including:

performing wireless communication; and

selectively switching between a first physical channel and a secondphysical channel in which both conditions of the number of symbols andthe number of resource blocks are different from each other and whichare allocated during a predetermined period in a time series to transmitcontrol information to a base station by a computer.

(23)

A communication method including:

performing wireless communication; and

notifying a terminal device of information regarding switching between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period in a time series to receive control informationfrom the terminal device by a computer.

(24)

A program causing a computer to:

perform wireless communication; and

selectively switch between a first physical channel and a secondphysical channel in which both conditions of the number of symbols andthe number of resource blocks are different from each other and whichare allocated during a predetermined period in a time series to transmitcontrol information to a base station.

(25)

A program causing a computer to:

perform wireless communication; and

notify a terminal device of information regarding switching between afirst physical channel and a second physical channel in which bothconditions of the number of symbols and the number of resource blocksare different from each other and which are allocated during apredetermined period in a time series to receive control informationfrom the terminal device.

REFERENCE SIGNS LIST

-   1 base station device-   101 higher layer processing unit-   103 control unit-   105 receiving unit-   1051 decoding unit-   1053 demodulating unit-   1055 demultiplexing unit-   1057 wireless receiving unit-   1059 channel measuring unit-   107 transmitting unit-   1071 encoding unit-   1073 modulating unit-   1075 multiplexing unit-   1077 wireless transmitting unit-   1079 link reference signal generating unit-   109 transceiving antenna-   130 network communication unit-   2 terminal device-   201 higher layer processing unit-   203 control unit-   205 receiving unit-   2051 decoding unit-   2053 demodulating unit-   2055 demultiplexing unit-   2057 wireless receiving unit-   2059 channel measuring unit-   207 transmitting unit-   2071 encoding unit-   2073 modulating unit-   2075 multiplexing unit-   2077 wireless transmitting unit-   2079 link reference signal generating unit-   209 transceiving antenna

1. A communication device comprising: a communication unit configured to perform wireless communication; and a control unit configured to selectively switch between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to transmit control information to a base station.
 2. The communication device according to claim 1, wherein the control unit switches between the first physical channel and the second physical channel on a basis of a timing instructed from the base station.
 3. The communication device according to claim 2, wherein, in a case in which a timing of self-contained transmission is instructed from the base station, the control unit switches to the physical channel in which the number of symbols is less among the first physical channel and the second physical channel on a basis of the timing.
 4. The communication device according to claim 2, comprising: a notification unit configured to notify the base station of information regarding a capability, wherein, after the notification of the information regarding the capability, the control unit receives an instruction related to the timing at which the first physical channel and the second physical channel are switched, from the base station.
 5. The communication device according to claim 1, wherein the control unit switches between the first physical channel and the second physical channel in accordance with a type of data to be transmitted to the base station.
 6. The communication device according to claim 1, wherein the control unit switches the first physical channel and the second physical channel in accordance with a frequency bandwidth for transmitting the control information.
 7. The communication device according to claim 1, wherein the control unit switches the first physical channel and the second physical channel in accordance with a calculation value of transmission power for transmitting the control information.
 8. The communication device according to claim 1, wherein the control unit switches the first physical channel and the second physical channel in accordance with a communication system applied to communication with the base station.
 9. The communication device according to claim 1, wherein the control unit switches the first physical channel and the second physical channel in accordance with a type of wireless access technology set by dual connectivity.
 10. The communication device according to claim 1, wherein the control unit multiplexes the first physical channel and the second physical channel in a time direction or a frequency direction during a period including the one or more predetermined periods.
 11. The communication device according to claim 10, wherein the control unit multiplexes the first physical channel and the second physical channel in the time direction by allocating the first physical channel during a second period located behind a first period in which the second physical channel is allocated, in the time direction among the two or more continuous predetermined periods.
 12. The communication device according to claim 10, wherein the control unit multiplexes the first physical channel and the second physical channel in the frequency direction by allocating the first physical channel to a side closer to an end in the frequency direction and allocating the second physical channel to a side closer to a center in the frequency direction, in a frequency bandwidth to which the first physical channel and the second physical channel are allocated.
 13. A communication device comprising: a communication unit configured to perform wireless communication; and a notification unit configured to notify a terminal device of information regarding switching between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to receive control information from the terminal device.
 14. The communication device according to claim 13, comprising: a control unit configured to control the allocation of the first physical channel and the second physical channel during the predetermined period, wherein, in the second physical channel, the number of resource blocks is greater and the number of symbols is less than in the first physical channel.
 15. The communication device according to claim 14, wherein the control unit allocates the second physical channel to a side closer to a rear in a time direction during the predetermined period.
 16. The communication device according to claim 15, wherein the control unit preferentially allocates an index for mapping the control information to the second physical channel, from the rear side in the time direction during the predetermined period.
 17. The communication device according to claim 15, wherein the control unit allocates at least a part of the second physical channel such that the part becomes different from another part in respective positions in the time direction and a frequency direction during the predetermined period.
 18. The communication device according to claim 14, wherein the control unit allocates the first physical channel to a side closer to an end in a frequency direction of the frequency bandwidth which is an allocation target of the first physical channel.
 19. The communication device according to claim 18, wherein the control unit preferentially allocates an index for mapping the control information to the first physical channel from the end side in the frequency direction of the frequency bandwidth.
 20. The communication device according to claim 18, wherein the control unit allocates at least a part of the first physical channel such that the part becomes different from another part in respective positions in a time direction and the frequency direction during the predetermined period.
 21. The communication device according to claim 18, wherein the control unit consecutively allocates the first physical channel to one end side in the frequency direction of the frequency bandwidth during the predetermined period.
 22. A communication method comprising: performing wireless communication; and selectively switching between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to transmit control information to a base station by a computer.
 23. A communication method comprising: performing wireless communication; and notifying a terminal device of information regarding switching between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to receive control information from the terminal device by a computer.
 24. A program causing a computer to: perform wireless communication; and selectively switch between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to transmit control information to a base station.
 25. A program causing a computer to: perform wireless communication; and notify a terminal device of information regarding switching between a first physical channel and a second physical channel in which both conditions of a number of symbols and a number of resource blocks are different from each other and which are allocated during a predetermined period in a time series to receive control information from the terminal device. 